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3s9n

Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, room temperature

Method: X-RAY DIFFRACTION Dmax: 164.8 Å Quality: GOOD
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1. Protein Identity and Related Structures Protein Identity & Related Structures

Transferrin receptor protein 1

Homo sapiens

UniProt P02786

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric（4） Consistent with protein copy count Chain A； UniProt 120–760 Fragment：UNP residues 120-760 Serotransferrin × 2 （P02787） NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K Resolution 3.25 Å R-free 0.289
2 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric（4） Consistent with protein copy count Chain B； UniProt 120–760 Fragment：UNP residues 120-760 Serotransferrin × 2 （P02787） NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K Resolution 3.25 Å R-free 0.289

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB Difference from Current Entry 3S9N Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Method and Experimental Conditions Structure Quality
11QC Human transferrin receptor ectodomain Deposited 2026-03-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain A 122–760（639 aa）
Chain B 122–760（639 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.40 Å
11RN Complex of B19V VP1u RBD and human transferrin receptor ectodomain Deposited 2026-03-10 Different construct Different mutation/modification Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 122–758（637 aa）
Chain B 122–758（637 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.40 Å
1CX8 CRYSTAL STRUCTURE OF THE ECTODOMAIN OF HUMAN TRANSFERRIN RECEPTOR Deposited 1999-08-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain A 122–760（639 aa） Fragment：RESIDUES 122-760
Chain B 122–760（639 aa） Fragment：RESIDUES 122-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 SM SAMARIUM (III) ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；291 K；2.4 M KCl 10 mM KPi 1.5% PEG 20K, pH 6.7, VAPOR DIFFUSION, HANGING DROP, temperature 18K
Resolution 3.20 Å R-free 0.284
1CX8 CRYSTAL STRUCTURE OF THE ECTODOMAIN OF HUMAN TRANSFERRIN RECEPTOR Deposited 1999-08-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain C 122–760（639 aa） Fragment：RESIDUES 122-760
Chain D 122–760（639 aa） Fragment：RESIDUES 122-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 SM SAMARIUM (III) ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；291 K；2.4 M KCl 10 mM KPi 1.5% PEG 20K, pH 6.7, VAPOR DIFFUSION, HANGING DROP, temperature 18K
Resolution 3.20 Å R-free 0.284
1CX8 CRYSTAL STRUCTURE OF THE ECTODOMAIN OF HUMAN TRANSFERRIN RECEPTOR Deposited 1999-08-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain E 122–760（639 aa） Fragment：RESIDUES 122-760
Chain F 122–760（639 aa） Fragment：RESIDUES 122-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 SM SAMARIUM (III) ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；291 K；2.4 M KCl 10 mM KPi 1.5% PEG 20K, pH 6.7, VAPOR DIFFUSION, HANGING DROP, temperature 18K
Resolution 3.20 Å R-free 0.284
1CX8 CRYSTAL STRUCTURE OF THE ECTODOMAIN OF HUMAN TRANSFERRIN RECEPTOR Deposited 1999-08-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 4 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain G 122–760（639 aa） Fragment：RESIDUES 122-760
Chain H 122–760（639 aa） Fragment：RESIDUES 122-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 SM SAMARIUM (III) ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；291 K；2.4 M KCl 10 mM KPi 1.5% PEG 20K, pH 6.7, VAPOR DIFFUSION, HANGING DROP, temperature 18K
Resolution 3.20 Å R-free 0.284
1DE4 HEMOCHROMATOSIS PROTEIN HFE COMPLEXED WITH TRANSFERRIN RECEPTOR Deposited 1999-11-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric
Chain C 121–760（640 aa） Fragment：ECTODOMAIN
Chain F 121–760（640 aa） Fragment：ECTODOMAIN
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；298 K；PEG 8000, TRIS, TRIMETHYLAMINE HCL, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.80 Å R-free 0.265
1DE4 HEMOCHROMATOSIS PROTEIN HFE COMPLEXED WITH TRANSFERRIN RECEPTOR Deposited 1999-11-12 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric
Chain I 121–760（640 aa） Fragment：ECTODOMAIN
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 GOL GLYCEROL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；298 K；PEG 8000, TRIS, TRIMETHYLAMINE HCL, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.80 Å R-free 0.265
1SUV Structure of Human Transferrin Receptor-Transferrin Complex Deposited 2004-03-26 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric
Chain A 122–760（639 aa）
Chain B 122–760（639 aa）
Not recorded CO3 CARBONATE ION × 4 FE FE (III) ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
Resolution 7.50 Å
2NSU Crystal structure of the ectodomain of human transferrin receptor fitted into a cryo-EM reconstruction of canine parvovirus and feline transferrin receptor complex Deposited 2006-11-06 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain A 122–760（639 aa） Fragment：THE ECTODOMAIN OF HUMAN TRANSFERRIN RECEPTOR
Chain B 122–760（639 aa） Fragment：THE ECTODOMAIN OF HUMAN TRANSFERRIN RECEPTOR
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer 0.02M TRIS-HCL；pH 7.5；0.02M TRIS-HCL
cryo-EM vitrification conditions Cryogen ETHANE；PLUNGED IN LIQUID ETHANE
Resolution 27.00 Å
3KAS Machupo virus GP1 bound to human transferrin receptor 1 Deposited 2009-10-19 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 121–760（640 aa） Fragment：residues 121-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 PO4 PHOSPHATE ION × 12 K POTASSIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；293 K；1.6 M sodium potassium phosphate, 150 mM NaCl, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.40 Å R-free 0.238
3S9L Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 2 Deposited 2011-06-01 Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 120–760（641 aa） Fragment：UNP residues 120-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.22 Å R-free 0.314
3S9L Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 2 Deposited 2011-06-01 Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain B 120–760（641 aa） Fragment：UNP residues 120-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.22 Å R-free 0.314
3S9M Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 1 Deposited 2011-06-01 Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 120–760（641 aa） Fragment：UNP residues 120-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 CO3 CARBONATE ION × 2 FE FE (III) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 20% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.32 Å R-free 0.332
3S9M Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 1 Deposited 2011-06-01 Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain B 120–760（641 aa） Fragment：UNP residues 120-760
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 CO3 CARBONATE ION × 2 FE FE (III) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 20% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.32 Å R-free 0.332
6D03 Cryo-EM structure of a Plasmodium vivax invasion complex essential for entry into human reticulocytes; one molecule of parasite ligand. Deposited 2018-04-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric
Chain A 121–760（640 aa）
Chain B 121–760（640 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 4 CO3 CARBONATE ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.68 Å
6D04 Cryo-EM structure of a Plasmodium vivax invasion complex essential for entry into human reticulocytes; two molecules of parasite ligand, subclass 1. Deposited 2018-04-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric
Chain A 121–760（640 aa）
Chain B 121–760（640 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 4 CO3 CARBONATE ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.74 Å
6D05 Cryo-EM structure of a Plasmodium vivax invasion complex essential for entry into human reticulocytes; two molecules of parasite ligand, subclass 2. Deposited 2018-04-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric
Chain A 121–760（640 aa）
Chain B 121–760（640 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 4 CO3 CARBONATE ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.80 Å
6GSR Single Particle Cryo-EM map of human Transferrin receptor 1 - H-Ferritin complex at 5.5 Angstrom resolution. Deposited 2018-06-15 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 26 PDB declaration: 26-meric
Chain Ab 121–760（640 aa）
Chain Aq 121–760（640 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 5.50 Å
6H5I Single Particle Cryo-EM map of human Transferrin receptor 1 - H-Ferritin complex. Deposited 2018-07-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 26 PDB declaration: 26-meric
Chain Ab 121–760（640 aa）
Chain Aq 121–760（640 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.90 Å
6OKD Crystal Structure of human transferrin receptor in complex with a cystine-dense peptide Deposited 2019-04-12 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain A 121–760（640 aa） Fragment：ligand binding domain
Not recorded MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1 GOL GLYCEROL × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；298 K；PEG 6000, Mes
Resolution 1.85 Å R-free 0.187
6OKD Crystal Structure of human transferrin receptor in complex with a cystine-dense peptide Deposited 2019-04-12 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain B 121–760（640 aa） Fragment：ligand binding domain
Not recorded MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1 GOL GLYCEROL × 6 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；298 K；PEG 6000, Mes
Resolution 1.85 Å R-free 0.187
6W3H Brain delivery of therapeutic proteins using an Fc fragment blood-brain barrier transport vehicle in mice and monkeys Deposited 2020-03-09 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric
Chain D 326–379（54 aa）
Chain D 194–296（103 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；297.15 K；20-25% PEG3350, 0.1M Bis-Tris pH6.5, and 0.2M LiSO4
Resolution 3.38 Å R-free 0.318
6W3H Brain delivery of therapeutic proteins using an Fc fragment blood-brain barrier transport vehicle in mice and monkeys Deposited 2020-03-09 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain C 326–379（54 aa）
Chain C 194–296（103 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；297.15 K；20-25% PEG3350, 0.1M Bis-Tris pH6.5, and 0.2M LiSO4
Resolution 3.38 Å R-free 0.318
6WRV Crystal structure of computationally designed protein 3DS18 in complex with the human Transferrin receptor ectodomain Deposited 2020-04-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric
Chain A 121–759（639 aa）
Chain B 121–759（639 aa）
Chain E 121–759（639 aa）
Not recorded CA CALCIUM ION × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；1.1M Sodium Malonate pH 7, 0.1M HEPES pH 7, 0.5% Jeffamine ED-2001 pH 7
Resolution 2.47 Å R-free 0.236
6WRW Crystal structure of computationally designed protein 2DS25.5 in complex with the human Transferrin receptor ectodomain Deposited 2020-04-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 121–760（640 aa）
Chain B 121–760（640 aa）
Not recorded CA CALCIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1M BICINE pH 8.5, 12% (w/v) monomethyl ether 550
Resolution 2.84 Å R-free 0.235
6WRX Crystal structure of computationally designed protein 2DS25.1 in complex with the human Transferrin receptor ectodomain Deposited 2020-04-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 121–760（640 aa）
Chain B 121–760（640 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 MAN alpha-D-mannopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.1M HEPES pH 7.5, 12% (w/v) polyethylene glycol 3350
Resolution 3.07 Å R-free 0.225
6Y76 AP01 - a redesigned transferrin receptor apical domain Deposited 2020-02-28 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 197–378（182 aa）
Not recorded NA SODIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；0.2 M ammonium fluoride and 20% v/v PEG 3350
Resolution 1.98 Å R-free 0.275
6Y76 AP01 - a redesigned transferrin receptor apical domain Deposited 2020-02-28 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 197–378（182 aa）
Not recorded NA SODIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；0.2 M ammonium fluoride and 20% v/v PEG 3350
Resolution 1.98 Å R-free 0.275
7ZQS Cryo-EM Structure of Human Transferrin Receptor 1 bound to DNA Aptamer Deposited 2022-05-02 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein–DNA Homooligomer；Protein × 2 PDB declaration: tetrameric
Chain B 1–760（760 aa）
Chain D 1–760（760 aa）
Not recorded MG MAGNESIUM ION × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.54 Å
8P0Z AP01-S2.3 - a variant of a redesigned transferrin receptor apical domain Deposited 2023-05-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 197–299（103 aa）
Chain A 332–377（46 aa）
Not recorded NA SODIUM ION × 2 BO3 BORIC ACID × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；11 mg/mL protein in 20 mM HEPES, pH 6.8, 150 mM NaCl mixed with 100 mM MIB buffer, pH 7.5, and 24 % PEG in a ratio 1:2
Resolution 1.88 Å R-free 0.236
9GH7 Complex of human TfR1 with a potent bicyclic peptide Deposited 2024-08-15 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 89–760（672 aa）
Not recorded CA CALCIUM ION × 2 GOL GLYCEROL × 2 A1ILE 1-(3,5-diethanoyl-1,3,5-triazinan-1-yl)ethanone × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；0.1 M ammonium tartrate dibasic pH 7.0, 12% (w/v) PEG 3350.
Resolution 2.08 Å R-free 0.235

23 other PDB entries and 32 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TFR1_HUMAN
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 14–654； UniProt 120–760 Author chain B； PDBConstruct 14–654； UniProt 120–760

Serotransferrin

Homo sapiens

UniProt P02787

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric（4） Consistent with protein copy count Chain C； UniProt 20–698 Fragment：UNP residues 20-698 Mutation：N427D, Y531F Transferrin receptor protein 1 × 2 （P02786） NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K Resolution 3.25 Å R-free 0.289
2 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric（4） Consistent with protein copy count Chain D； UniProt 20–698 Fragment：UNP residues 20-698 Mutation：N427D, Y531F Transferrin receptor protein 1 × 2 （P02786） NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K Resolution 3.25 Å R-free 0.289

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB Difference from Current Entry 3S9N Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Method and Experimental Conditions Structure Quality
1A8E HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE Deposited 1998-03-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 22–350（329 aa） Fragment：N-TERMINAL LOBE
Not recorded CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.75；277 K；PROTEIN WAS CRYSTALLIZED FROM 26% PEG 4000. BUFFER WAS 40MM NA CACODYLATE, PH 5.75, WITH 20MM NA BICARBONATE. CRYSTALS GROWN AT 4 DEGREES C USING THE HANGING DROP METHOD., vapor diffusion - hanging drop, temperature 277K
Resolution 1.60 Å
1A8F HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE Deposited 1998-03-25 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 22–350（329 aa） Fragment：N-TERMINAL LOBE
Not recorded CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.1；PROTEIN WAS CRYSTALLIZED FROM 40% (V/V) ETHANOL WITH 50MM POTASSIUM CACODYLATE, PH 6.1. GROWN IN SITTING DROPS AT 277 K. RESERVOIRS CONTAINED 40% (V/V) ETHANOL, 50MM POTASSIUM CACODYLATE, PH 5.8 - 6.3. PRIOR TO CRYSTALLIZATION, THE PROTEIN WAS DIALYSED AGAINST SODIUM BICARBONATE, PH 8.1, vapor diffusion - sitting drop
Resolution 1.80 Å R-free 0.250
1B3E HUMAN SERUM TRANSFERRIN, N-TERMINAL LOBE, EXPRESSED IN PICHIA PASTORIS Deposited 1998-12-09 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 23–352（330 aa） Fragment：N-TERMINAL LOBE
Not recorded FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.25；277 K；PROTEIN WAS CRYSTALLIZED FROM 40% (V/V) ETHANOL WITH 50MM SODIUM CACODYLATE, PH 6.25. GROWN IN SITTING DROPS AT 277 K. RESERVOIRS CONTAINED 40% (V/V) ETHANOL, 50MM SODIUM CACODYLATE, PH 5.8 - 6.3. PRIOR TO CRYSTALLIZATION, THE PROTEIN WAS DIALYSED AGAINST SODIUM BICARBONATE, PH 8.1, VAPOR DIFFUSION, SITTING DROP, temperature 277.0K
Resolution 2.50 Å R-free 0.255
1BP5 HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE, APO FORM Deposited 1998-08-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–356（337 aa） Fragment：N-TERMINAL LOBE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 5.3；PROTEIN WAS CRYSTALLIZED FROM 35% MPD. BUFFER WAS 50MM POTASSIUM ACETATE, PH 5.3, WITH 50MM KCL, AND 20MM NA BICARBONATE CRYSTALS GROWN AT 4 DEGREES C USING THE SITTING DROP METHOD.
Resolution 2.20 Å R-free 0.292
1BP5 HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE, APO FORM Deposited 1998-08-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 20–356（337 aa） Fragment：N-TERMINAL LOBE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 5.3；PROTEIN WAS CRYSTALLIZED FROM 35% MPD. BUFFER WAS 50MM POTASSIUM ACETATE, PH 5.3, WITH 50MM KCL, AND 20MM NA BICARBONATE CRYSTALS GROWN AT 4 DEGREES C USING THE SITTING DROP METHOD.
Resolution 2.20 Å R-free 0.292
1BP5 HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE, APO FORM Deposited 1998-08-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain C 20–356（337 aa） Fragment：N-TERMINAL LOBE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 5.3；PROTEIN WAS CRYSTALLIZED FROM 35% MPD. BUFFER WAS 50MM POTASSIUM ACETATE, PH 5.3, WITH 50MM KCL, AND 20MM NA BICARBONATE CRYSTALS GROWN AT 4 DEGREES C USING THE SITTING DROP METHOD.
Resolution 2.20 Å R-free 0.292
1BP5 HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE, APO FORM Deposited 1998-08-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain D 20–356（337 aa） Fragment：N-TERMINAL LOBE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 5.3；PROTEIN WAS CRYSTALLIZED FROM 35% MPD. BUFFER WAS 50MM POTASSIUM ACETATE, PH 5.3, WITH 50MM KCL, AND 20MM NA BICARBONATE CRYSTALS GROWN AT 4 DEGREES C USING THE SITTING DROP METHOD.
Resolution 2.20 Å R-free 0.292
1BTJ HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE, APO FORM, CRYSTAL FORM 2 Deposited 1998-09-01 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–356（337 aa） Fragment：N-TERMINAL LOBE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.3；PROTEIN DROP: 20 MG/ML PROTEIN, 20MM NAHCO3, 50 MM KCL. RESERVOIR: 50 MM POTASSIUM ACETATE, PH 5.3, 35% MPD., VAPOR DIFFUSION, SITTING DROP
Resolution 3.20 Å R-free 0.312
1BTJ HUMAN SERUM TRANSFERRIN, RECOMBINANT N-TERMINAL LOBE, APO FORM, CRYSTAL FORM 2 Deposited 1998-09-01 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 20–356（337 aa） Fragment：N-TERMINAL LOBE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.3；PROTEIN DROP: 20 MG/ML PROTEIN, 20MM NAHCO3, 50 MM KCL. RESERVOIR: 50 MM POTASSIUM ACETATE, PH 5.3, 35% MPD., VAPOR DIFFUSION, SITTING DROP
Resolution 3.20 Å R-free 0.312
1D3K HUMAN SERUM TRANSFERRIN Deposited 1999-09-29 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 22–350（329 aa） Fragment：N-TERMINAL LOBE
Mutation：K206Q CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.75；277 K；PEG 4000, sodium bicarbonate, sodium cacodylate, pH 5.75, VAPOR DIFFUSION, HANGING DROP, temperature 277.0K
Resolution 1.80 Å R-free 0.225
1D4N HUMAN SERUM TRANSFERRIN Deposited 1999-10-04 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 22–350（329 aa） Fragment：N-TERMINAL LOBE
Mutation：H207E CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.75；277 K；PEG 4000, SODIUM BICARBONATE, SODIUM CACODYLATE, pH 5.75, VAPOR DIFFUSION, HANGING DROP, temperature 277K
Resolution 2.00 Å R-free 0.218
1DTG HUMAN TRANSFERRIN N-LOBE MUTANT H249E Deposited 2000-01-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–353（334 aa） Fragment：N-TERMINAL HALF MOLECULE
Mutation：H249E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.1；277 K；50 mM cacodylate 40% ethanol, pH 6.1, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 2.40 Å R-free 0.294
1FQE CRYSTAL STRUCTURES OF MUTANT (K206A) THAT ABOLISH THE DILYSINE INTERACTION IN THE N-LOBE OF HUMAN TRANSFERRIN Deposited 2000-09-04 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–350（331 aa） Fragment：N-LOBE
Mutation：K206A FE FE (III) ION × 1 CO3 CARBONATE ION × 1 K POTASSIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；293 K；20-25% PolyEthyleneGlycol 3350, 100mM Potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 1.80 Å R-free 0.237
1FQF CRYSTAL STRUCTURES OF MUTANT (K296A) THAT ABOLISH THE DILYSINE INTERACTION IN THE N-LOBE OF HUMAN TRANSFERRIN Deposited 2000-09-04 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–350（331 aa） Fragment：N-LOBE
Mutation：K296A FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；293 K；18% PolyEthyleneGlycol 3350, 100mM Potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.10 Å R-free 0.295
1JQF Human Transferrin N-Lobe Mutant H249Q Deposited 2001-08-06 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–353（334 aa） Fragment：N-TERMINUS (Residues 20-353)
Mutation：H249Q CO3 CARBONATE ION × 1 FE FE (III) ION × 1 K POTASSIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Hanging drop. Protein solution 35 mg/ml protein in 0.1M ammonium bicarbonate pH 7.4. Reservoir solution 0.1M potassium acetate, pH 7.4, 20-25% PEG 3350. Equal volumes of protein and reservoir solutions mixed., VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 1.85 Å R-free 0.246
1N7W Crystal Structure of Human Serum Transferrin, N-Lobe L66W mutant Deposited 2002-11-18 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–350（331 aa） Fragment：N-TERMINAL LOBE
Mutation：L66W CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.7；293 K；0.2M POTASSIUM ACETATE, 20% PEG 3350, pH 7.7, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.20 Å R-free 0.237
1N7X HUMAN SERUM TRANSFERRIN, N-LOBE Y45E MUTANT Deposited 2002-11-18 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–350（331 aa） Fragment：N-TERMINAL LOBE
Mutation：Y45E CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.7；293 K；0.2M POTASSIUM ACETATE, 20% PEG 3350, pH 7.7, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.10 Å R-free 0.243
1N84 HUMAN SERUM TRANSFERRIN, N-LOBE Deposited 2002-11-19 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–350（331 aa） Fragment：N-TERMINAL LOBE
Not recorded CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.7；293 K；0.2M POTASSIUM ACETATE, 20% PEG 3350, pH 7.7, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.05 Å R-free 0.228
1OQG Crystal structure of the D63E mutant of the N-lobe human transferrin Deposited 2003-03-09 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–356（337 aa） Fragment：N-lobe
Mutation：D63E CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；PEG 3350, potassium acetate, ammonium bicarbonate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 1.90 Å R-free 0.261
1OQH Crystal Structure of the R124A mutant of the N-lobe human transferrin Deposited 2003-03-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–356（337 aa） Fragment：N-lobe
Mutation：R124A CO3 CARBONATE ION × 1 FE FE (III) ION × 1 K POTASSIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；PEG 3350, potassium acetate, ammonium bicarbonate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.40 Å R-free 0.288
1RYO Human serum transferrin, N-lobe bound with oxalate Deposited 2003-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–346（327 aa） Fragment：N-terminal lobe (residues 20-346)
Not recorded OXL OXALATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.7；293 K；0.2M K-Acetate, 10mM KCl, 20% PEG 3350, pH 7.7, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 1.20 Å R-free 0.235
1SUV Structure of Human Transferrin Receptor-Transferrin Complex Deposited 2004-03-26 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric
Chain C 22–350（329 aa） Fragment：repeat 1
Chain D 22–350（329 aa） Fragment：repeat 1
Not recorded CO3 CARBONATE ION × 4 FE FE (III) ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
Resolution 7.50 Å
28MR X-ray structure of the adduct between human serum transferrin with Fe3+ bound at the C-lobe and diruthenium tetraacetate chloride Deposited 2026-02-08 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLI MALONATE ION × 1 GOL GLYCEROL × 1 ACT ACETATE ION × 1 RU RUTHENIUM ION × 1 CL CHLORIDE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；15% (w/v) PEG 3350, 16% (v/v) glycerol, 8 mM disodium malonate, 150 mM Na-PIPES pH 6.5
Resolution 2.26 Å R-free 0.234
28MS X-ray structure of the adduct between human serum transferrin with Fe3+ bound at the C-lobe and dirhodium tetraacetate Deposited 2026-02-08 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLI MALONATE ION × 1 ACT ACETATE ION × 3 PEG DI(HYDROXYETHYL)ETHER × 2 GOL GLYCEROL × 1 A1JZ3 Rhodium tetraacetate dihydrate × 9 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；15% (w/v) PEG 3350 16% (v/v) glycerol 8 mM disodium malonate 150 mM Na-PIPES pH 6.5
Resolution 2.37 Å R-free 0.244
2HAU Apo-Human Serum Transferrin (Non-Glycosylated) Deposited 2006-06-13 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 23–698（676 aa）
Mutation：N413D,N611D Non-standard monomer：Yes (specific site not provided by mmCIF) CIT CITRIC ACID × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；15 mg/ml protein, 0.3 M ammonium citrate, 16-18% PEG 3350 , pH 6.5, VAPOR DIFFUSION, temperature 293K
Resolution 2.70 Å R-free 0.324
2HAU Apo-Human Serum Transferrin (Non-Glycosylated) Deposited 2006-06-13 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 23–698（676 aa）
Mutation：N413D,N611D Non-standard monomer：Yes (specific site not provided by mmCIF) CIT CITRIC ACID × 3 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 6.5；293 K；15 mg/ml protein, 0.3 M ammonium citrate, 16-18% PEG 3350 , pH 6.5, VAPOR DIFFUSION, temperature 293K
Resolution 2.70 Å R-free 0.324
2HAV Apo-Human Serum Transferrin (Glycosylated) Deposited 2006-06-13 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 23–698（676 aa）
Not recorded CIT CITRIC ACID × 3 GOL GLYCEROL × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；294 K；30 mg/ml protein, 0.2 M ammonium citrate pH 7.0, 20% PEG-3350, 15% glycerol, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 2.70 Å R-free 0.293
2HAV Apo-Human Serum Transferrin (Glycosylated) Deposited 2006-06-13 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 23–698（676 aa）
Not recorded CIT CITRIC ACID × 4 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；294 K；30 mg/ml protein, 0.2 M ammonium citrate pH 7.0, 20% PEG-3350, 15% glycerol, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 2.70 Å R-free 0.293
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain C 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain D 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 5 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain E 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 6 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain F 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 7 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain G 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 8 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain H 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O7U Crystal structure of K206E/K296E mutant of the N-terminal half molecule of human transferrin Deposited 2006-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 9 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain I 20–356（337 aa） Fragment：N-lobe
Mutation：K206E, K296E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；291 K；Protein: 35mg/ml, 0.1M ammonium bicarbonate. Well: 20% PEG 3350, 0.2 M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.259
2O84 Crystal structure of K206E mutant of N-lobe human transferrin Deposited 2006-12-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain X 20–356（337 aa） Fragment：N-lobe
Mutation：K206E FE FE (III) ION × 1 CO3 CARBONATE ION × 1 K POTASSIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；293 K；Protein: 35mg/ml, 0.1M ammonium bicrbonate. Well: 18% PEG3350, 0.2M potassium acetate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.60 Å R-free 0.269
3FGS Crystal structure of G65R/K206E double mutant of the N-lobe human transferrin Deposited 2008-12-08 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–356（337 aa） Fragment：Peptidase S60 1 domain
Mutation：G65R, K206E CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.7；293 K；200 mM potassium acetate buffer (pH 7.7) containing 10 mM KCl and 18% polyethylene glycol 3350. Concentration of the mutant was 17.5 mg/mL. Crystals appeared in approximately a week following micro-seeding with wild-type N-lobe, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 1.80 Å R-free 0.246
3QYT Diferric bound human serum transferrin Deposited 2011-03-03 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 2 CO3 CARBONATE ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.4；271 K；0.01M HEPES, 15% PEG3000, pH 7.4, vapor diffusion, sitting drop, temperature 271K
Resolution 2.80 Å R-free 0.275
3S9L Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 2 Deposited 2011-06-01 Different mutation/modification Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain C 20–698（679 aa） Fragment：UNP residues 20-698
Mutation：N427D,Y440F, Y531F N625D NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.22 Å R-free 0.314
3S9L Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 2 Deposited 2011-06-01 Different mutation/modification Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain D 20–698（679 aa） Fragment：UNP residues 20-698
Mutation：N427D,Y440F, Y531F N625D NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 FE FE (III) ION × 2 CO3 CARBONATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 10% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.22 Å R-free 0.314
3S9M Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 1 Deposited 2011-06-01 Different mutation/modification Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain C 20–698（679 aa） Fragment：UNP residues 20-698
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 CO3 CARBONATE ION × 2 FE FE (III) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 20% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.32 Å R-free 0.332
3S9M Complex between transferrin receptor 1 and transferrin with iron in the N-Lobe, cryocooled 1 Deposited 2011-06-01 Different mutation/modification Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain D 20–698（679 aa） Fragment：UNP residues 20-698
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 CO3 CARBONATE ION × 2 FE FE (III) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5% PEG 3350, 0.2 M MgCl2, 20% 1,2-propanediol, pH Hepes 7.5, vapor diffusion, hanging drop, temperature 293K
Resolution 3.32 Å R-free 0.332
3SKP The structure of apo-human transferrin C-lobe with bound sulfate ions Deposited 2011-06-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 358–698（341 aa） Fragment：iron binding protein
Not recorded SO4 SULFATE ION × 8 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；294 K；0.2 M potassium sulfate, 2.2 M ammonium sulfate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 1.70 Å R-free 0.198
3SKP The structure of apo-human transferrin C-lobe with bound sulfate ions Deposited 2011-06-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric
Chain A 358–698（341 aa） Fragment：iron binding protein
Not recorded SO4 SULFATE ION × 32 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；294 K；0.2 M potassium sulfate, 2.2 M ammonium sulfate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 1.70 Å R-free 0.198
3SKP The structure of apo-human transferrin C-lobe with bound sulfate ions Deposited 2011-06-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric
Chain A 358–698（341 aa） Fragment：iron binding protein
Not recorded SO4 SULFATE ION × 16 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；294 K；0.2 M potassium sulfate, 2.2 M ammonium sulfate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 1.70 Å R-free 0.198
3V83 The 2.1 angstrom crystal structure of diferric human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 SO4 SULFATE ION × 5 P6G HEXAETHYLENE GLYCOL × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；100mM HEPES, pH 7.5, 1.6 M ammonium sulfate, and 2% PEG 1000, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.10 Å R-free 0.230
3V83 The 2.1 angstrom crystal structure of diferric human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 SO4 SULFATE ION × 9 P6G HEXAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；100mM HEPES, pH 7.5, 1.6 M ammonium sulfate, and 2% PEG 1000, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.10 Å R-free 0.230
3V83 The 2.1 angstrom crystal structure of diferric human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain C 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 SO4 SULFATE ION × 7 P6G HEXAETHYLENE GLYCOL × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；100mM HEPES, pH 7.5, 1.6 M ammonium sulfate, and 2% PEG 1000, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.10 Å R-free 0.230
3V83 The 2.1 angstrom crystal structure of diferric human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain D 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 SO4 SULFATE ION × 9 P6G HEXAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；100mM HEPES, pH 7.5, 1.6 M ammonium sulfate, and 2% PEG 1000, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.10 Å R-free 0.230
3V83 The 2.1 angstrom crystal structure of diferric human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 5 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain E 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 SO4 SULFATE ION × 9 P6G HEXAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；100mM HEPES, pH 7.5, 1.6 M ammonium sulfate, and 2% PEG 1000, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.10 Å R-free 0.230
3V83 The 2.1 angstrom crystal structure of diferric human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 6 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain F 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 SO4 SULFATE ION × 5 P6G HEXAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；100mM HEPES, pH 7.5, 1.6 M ammonium sulfate, and 2% PEG 1000, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.10 Å R-free 0.230
3V89 The crystal structure of transferrin binding protein A (TbpA) from Neisseria meningitidis serogroup B in complex with the C-lobe of human transferrin Deposited 2011-12-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain B 356–698（343 aa） Fragment：C-lobe (UNP residues 356-698)
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；21% PEG 1000, 100mM sodium acetate buffer (pH 4.8), 200mM NaCl, 0.1% LDAO and 3% heptane-1,2,3-triol, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 3.10 Å R-free 0.287
3V8X The crystal structure of transferrin binding protein A (TbpA) from Neisserial meningitidis serogroup B in complex with full length human transferrin Deposited 2011-12-23 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric
Chain B 1–698（698 aa）
Not recorded C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；20% Peg3350 and 200 mM BaBr2, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 2.60 Å R-free 0.267
3VE1 The 2.9 angstrom crystal structure of Transferrin binding protein B (TbpB) from serogroup B M982 Neisseria meningitidis in complex with human transferrin Deposited 2012-01-06 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain B 20–698（679 aa）
Not recorded GOL GLYCEROL × 8 CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；0.1M sodium cacodylate pH 6.5, 14% PEG 3350, 0.1M sodium malonate, and 20% glycerol, vapor diffusion, hanging drop, temperature 293K
Resolution 2.96 Å R-free 0.249
3VE1 The 2.9 angstrom crystal structure of Transferrin binding protein B (TbpB) from serogroup B M982 Neisseria meningitidis in complex with human transferrin Deposited 2012-01-06 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain D 20–698（679 aa）
Not recorded GOL GLYCEROL × 5 CO3 CARBONATE ION × 1 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；0.1M sodium cacodylate pH 6.5, 14% PEG 3350, 0.1M sodium malonate, and 20% glycerol, vapor diffusion, hanging drop, temperature 293K
Resolution 2.96 Å R-free 0.249
4H0W Bismuth bound human serum transferrin Deposited 2012-09-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 CO3 CARBONATE ION × 2 BS3 Bismuth(III) ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 NTA NITRILOTRIACETIC ACID × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.4；271 K；0.01M HEPES, 15% PEG3000, PH 7.4, VAPOR DIFFUSION, SITTING DROP, temperature 271K
Resolution 2.40 Å R-free 0.256
4X1B Human serum transferrin with ferric ion bound at the C-lobe only Deposited 2014-11-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLI MALONATE ION × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6；298 K；0.1M PIPES, 17% PEG3350, 18% Glycerol
Resolution 2.45 Å R-free 0.227
4X1D Ytterbium-bound human serum transferrin Deposited 2014-11-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded YB YTTERBIUM (III) ION × 1 MLI MALONATE ION × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6；298 K；0.1M PIPES, 17% PEG3350, 18% Glycerol
Resolution 2.80 Å R-free 0.231
4X1D Ytterbium-bound human serum transferrin Deposited 2014-11-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 20–698（679 aa）
Not recorded YB YTTERBIUM (III) ION × 1 MLI MALONATE ION × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6；298 K；0.1M PIPES, 17% PEG3350, 18% Glycerol
Resolution 2.80 Å R-free 0.231
5DYH Ti(IV) bound human serum transferrin Deposited 2015-09-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 1–698（698 aa）
Not recorded CIT CITRIC ACID × 6 4TI TITANIUM ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.4；296 K；10-13% PEG3350 100 mM Ammonium Citrate buffer
Resolution 2.68 Å R-free 0.237
5DYH Ti(IV) bound human serum transferrin Deposited 2015-09-24 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 1–698（698 aa）
Not recorded CIT CITRIC ACID × 5 4TI TITANIUM ION × 1 CO3 CARBONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.4；296 K；10-13% PEG3350 100 mM Ammonium Citrate buffer
Resolution 2.68 Å R-free 0.237
5H52 Structure of Titanium-bound human serum transferrin Deposited 2016-11-04 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded MLI MALONATE ION × 1 4TI TITANIUM ION × 2 CIT CITRIC ACID × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；298 K；PIPES-Na 0.1M, PEG 3350 17%, disodium malonate 8mM, glycerol 18%
Resolution 3.00 Å R-free 0.224
5WTD Structure of human serum transferrin bound ruthenium at N-lobe Deposited 2016-12-11 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLI MALONATE ION × 1 RU RUTHENIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 6.6；298 K；PIPES-Na 100 mM, disodium malonate 8 mM, PEG3350 17%, glycerol 18%
Resolution 2.50 Å R-free 0.214
5X5P Human serum transferrin bound to ruthenium NTA Deposited 2017-02-17 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded MLI MALONATE ION × 1 FE FE (III) ION × 1 RU RUTHENIUM ION × 4 NTA NITRILOTRIACETIC ACID × 2 NA SODIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；298 K；PIPES-Na 100mM pH 6.6, disodium malonate 8mM, PEG 3350 18%, glycerol 17%
Resolution 2.70 Å R-free 0.219
5Y6K Human serum trnasferrin bound to a fluorescent probe Deposited 2017-08-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded MLI MALONATE ION × 1 FE FE (III) ION × 2 8R6 (2S)-6-[2-(7-azido-4-methyl-2-oxidanylidene-chromen-3-yl)ethanoylamino]-2-[bis(2-hydroxy-2-oxoethyl)amino]hexanoic acid × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；298 K；PIPES-Na 0.1M pH 6.6, disodium malonate 8mM, PEG 3350 17%, glycerol 18%
Resolution 2.86 Å R-free 0.235
6CTC Crystal structure of human transferrin bound to Triferic FPC iron pyrophosphate Deposited 2018-03-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 2 CO3 CARBONATE ION × 1 POP PYROPHOSPHATE 2- × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；291 K；Apo human transferrin (ProSpec pro-325 purified by Q-sepharose) at 56 mg/mL (0.76 mM) against Morpheus screen condition D4 12.5% PEG 1000, 12.5% PEG3350, 12.5% MPD, 0.02 M each 1,6-hexanediol, 1-butanol, RS-1,2-propanediol, 2-propanol, 1,4-butanediol, 1,3-propanediol, 0.1 M MES/imidazole pH 6.5, crystal tracking ID 246352d4, unique puck ID suv0-5
Resolution 2.60 Å R-free 0.253
6D03 Cryo-EM structure of a Plasmodium vivax invasion complex essential for entry into human reticulocytes; one molecule of parasite ligand. Deposited 2018-04-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric
Chain C 1–698（698 aa）
Chain D 1–698（698 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 4 CO3 CARBONATE ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.68 Å
6D04 Cryo-EM structure of a Plasmodium vivax invasion complex essential for entry into human reticulocytes; two molecules of parasite ligand, subclass 1. Deposited 2018-04-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric
Chain C 1–698（698 aa）
Chain D 1–698（698 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 4 CO3 CARBONATE ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.74 Å
6D05 Cryo-EM structure of a Plasmodium vivax invasion complex essential for entry into human reticulocytes; two molecules of parasite ligand, subclass 2. Deposited 2018-04-10 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric
Chain C 1–698（698 aa）
Chain D 1–698（698 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 4 CO3 CARBONATE ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.80 Å
6JAS Human serum transferrin with iron citrate bound Deposited 2019-01-25 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 2 MLI MALONATE ION × 1 CIT CITRIC ACID × 1 X-RAY DIFFRACTION
X-ray crystallization conditions EVAPORATION；pH 6.6；298 K；PIPES-NaOH 0.1M pH 6.6, di-sodium malonate 8 mM, glycerol 18%, PEG3350 17%
Resolution 2.50 Å R-free 0.219
6SOY Trypanosoma brucei transferrin receptor in complex with human transferrin Deposited 2019-08-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain C 22–698（677 aa）
Not recorded FE FE (III) ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；291 K；12% (w/v) PEG 5000 MME, 12% 2-methyl-2,4-pentanediol, 0.1 M MES, pH 6.5
Resolution 2.75 Å R-free 0.233
6SOZ Glycosylated Trypanosoma brucei transferrin receptor in complex with human transferrin Deposited 2019-08-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric
Chain C 22–698（677 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 FE FE (III) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；291 K；12% (w/v) PEG 5000 MME, 12% 2-methyl-2,4-pentanediol, 0.1 M MES, pH 6.5
Resolution 3.42 Å R-free 0.241
7FFM Human serum transferrin with five osmium binding sites Deposited 2021-07-23 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded 4TI TITANIUM ION × 1 MLI MALONATE ION × 1 NTA NITRILOTRIACETIC ACID × 1 OS OSMIUM ION × 5 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；298 K；PIPES-Na 100mM pH 6.5, di-sodium malonate 8mM, PEG3350 17%, glycerol 18%
Resolution 3.06 Å R-free 0.212
7FFU Osmium-bound human serum transferrin Deposited 2021-07-23 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLI MALONATE ION × 1 OS OSMIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；298 K；PIPES-NaOH 0.1M pH 6.6, disodium malonate 8mM, glycerol 18%, PEG 3350 17%
Resolution 2.60 Å R-free 0.229
7Q1L Glycosilated Human Serum Apo-tranferrin Deposited 2021-10-20 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric
Chain A 23–698（676 aa）
Not recorded GOL GLYCEROL × 5 EDO 1,2-ETHANEDIOL × 1 MG MAGNESIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；291.5 K；0.2 M Ammonium Citrate pH 7.0, 20% PEG 3350
Resolution 3.00 Å R-free 0.249
7Q1L Glycosilated Human Serum Apo-tranferrin Deposited 2021-10-20 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric
Chain B 23–698（676 aa）
Not recorded GOL GLYCEROL × 2 EDO 1,2-ETHANEDIOL × 1 SO4 SULFATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；291.5 K；0.2 M Ammonium Citrate pH 7.0, 20% PEG 3350
Resolution 3.00 Å R-free 0.249
8BRC Crystal structure of the adduct between human serum transferrin and cisplatin Deposited 2022-11-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLI MALONATE ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 PT PLATINUM (II) ION × 1 NH3 AMMONIA × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；15% w/v PEG 3350, 16% v/v glycerol, 8 mM disodium malonate, and 150 mM Na-PIPES pH 6.5
Resolution 3.17 Å R-free 0.243
9CDQ Transferrin Binding Protein A in complex with transferrin (iron bound in N lobe only) Deposited 2024-06-25 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain F 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 1 FE FE (III) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.76 Å
9CLM Transferrin Binding Protein A in complex with transferrin binding protein B and two molecules of transferrin Deposited 2024-07-11 Different construct Different mutation/modification Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain F 1–698（698 aa）
Chain G 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 3 FE FE (III) ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.30 Å
9CLT Transferrin Binding Protein A in complex with transferrin binding protein B and transferrin (iron bound to N lobe only) Deposited 2024-07-12 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain F 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 1 FE FE (III) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.60 Å
9CMG Transferrin Binding Protein A in complex with transferrin binding protein B and transferrin (iron bound in both lobes of Tf) Deposited 2024-07-15 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain F 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.71 Å
9DC4 Transferrin Binding Protein A in complex with transferrin binding protein B, transferrin and globular domain of TonB Deposited 2024-08-25 Different construct Different mutation/modification Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain F 1–696（696 aa）
Not recorded BCT BICARBONATE ION × 1 FE FE (III) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
9H49 Crystal structure of the adduct between human serum transferrin (apo-form) and cisplatin Deposited 2024-10-17 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded CIT CITRIC ACID × 3 PT PLATINUM (II) ION × 2 NH3 AMMONIA × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；20% w/v PEG 3350 and 200 mM ammonium citrate pH 7.0
Resolution 3.52 Å R-free 0.249
9H49 Crystal structure of the adduct between human serum transferrin (apo-form) and cisplatin Deposited 2024-10-17 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 20–698（679 aa）
Not recorded CIT CITRIC ACID × 3 PT PLATINUM (II) ION × 2 NH3 AMMONIA × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；20% w/v PEG 3350 and 200 mM ammonium citrate pH 7.0
Resolution 3.52 Å R-free 0.249
9H4V Crystal structure of the adduct formed upon reaction of aurothiomalate with human serum transferrin (apo-form) Deposited 2024-10-21 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 20–698（679 aa）
Not recorded CIT CITRIC ACID × 4 AU GOLD ION × 9 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；20% w/v PEG 3350 and 200 mM trisodium citrate
Resolution 3.02 Å R-free 0.296
9H4V Crystal structure of the adduct formed upon reaction of aurothiomalate with human serum transferrin (apo-form) Deposited 2024-10-21 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain B 20–698（679 aa）
Not recorded CIT CITRIC ACID × 4 AU GOLD ION × 10 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；20% w/v PEG 3350 and 200 mM trisodium citrate
Resolution 3.02 Å R-free 0.296
9PA8 NmTbpB and Tf protein complex Deposited 2025-06-25 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain F 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 2 FE FE (III) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
9THO Crystal structure of the adduct formed upon reaction of [V(IV)O(acetylacetonate)2] with human serum transferrin with Fe(III) bound at the C-lobe only Deposited 2025-12-03 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain AAA 20–698（679 aa）
Not recorded BCT BICARBONATE ION × 11 GOL GLYCEROL × 2 FE FE (III) ION × 1 MLA MALONIC ACID × 1 A1JJT bis(oxidanyl)-oxidanylidene-(oxidanyl(oxidanylidene)vanadio)oxy-vanadium × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；15% (w/v) PEG 3350, 16% (v/v) glycerol, 8 mM disodium malonate, 150 mM Na-PIPES pH 6.5
Resolution 2.55 Å R-free 0.249
9THQ Crystal structure of the human serum transferrin with Fe(III) bound at the C-lobe only Deposited 2025-12-03 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain AAA 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLA MALONIC ACID × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 GOL GLYCEROL × 1 BCT BICARBONATE ION × 9 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；15% (w/v) PEG 3350, 16% (v/v) glycerol, 8 mM disodium malonate, 150 mM Na-PIPES pH 6.5
Resolution 2.44 Å R-free 0.231
9THR Crystal structure of the human serum transferrin with Fe(III) bound at the C-lobe only (treated with DMSO) Deposited 2025-12-03 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain AAA 20–698（679 aa）
Not recorded FE FE (III) ION × 1 MLA MALONIC ACID × 1 GOL GLYCEROL × 1 BCT BICARBONATE ION × 5 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；15% (w/v) PEG 3350, 16% (v/v) glycerol, 8 mM disodium malonate, 150 mM Na-PIPES pH 6.5
Resolution 3.20 Å R-free 0.249
9YZ4 Neisseria gonorrhoeae Transferrin Binding Protein A in complex with Transferrin Binding Protein B and transferrin (iron bound in N lobe only) Deposited 2025-10-29 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain F 1–698（698 aa）
Not recorded BCT BICARBONATE ION × 1 FE FE (III) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.26 Å

64 other PDB entries and 93 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TRFE_HUMAN
Isoform —
PDB entities 2
Chains and sequence ranges Author chain C； PDBConstruct 15–693； UniProt 20–698 Author chain D； PDBConstruct 15–693； UniProt 20–698

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

SAXS profile for 3s9n

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 3s9n
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2. Structure Basics 2. Structure Basics

Entry ID entry_id3s9n
Deposition date deposition_date2011-06-01
Structure title titleComplex between transferrin receptor 1 and transferrin with iron in the N-Lobe, room temperature
Keywords keywordsTransferrin receptor complex, transferrin superfamily, carboxypeptidase like, Transport Protein; TRANSPORT PROTEIN
Experimental Method methodX-RAY DIFFRACTION
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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier49.19 Å
Radius of gyration Rg (electron density) rg_electron48.74 Å
Forward intensity I(0) i0819877000.00
Molecular weight molecular_weight231350.0 kDa
Excluded volume excluded_volume286210 ų
Envelope volume envelope_volume426570 ų
Hydration-shell volume shell_volume74031 ų
Envelope diameter envelope_diameter168.3 Å
Shell Rg shell_rg51.79 Å
Envelope Rg envelope_rg47.88 Å
Shape Rg shape_rg48.74 Å
Total Rg total_rg48.83 Å
Total atoms total_atoms16304
Residues n_residues2245
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 Å−1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3
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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax164.8 Å
Rg (real space) rg_real49.35 Å
Rg uncertainty (real space) rg_real_error1.48 Å
I(0) (real space) i0_real8.1990e+08
I(0) uncertainty (real space) i0_real_error1.6250e+07
Rg (reciprocal space) rg_reciprocal49.19 Å
I(0) (reciprocal space) i0_reciprocal819700000.0000
Solution quality estimate total_estimate0.8767
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary51.5 Å
Skewness Skewness skewness0.352
Kurtosis Kurtosis kurtosis-0.546
Angular range angular_range— – 0.1600 Å−1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha78250000.0000
Real-space data points n_real_points33
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.886; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.976; Smooth: 0.758
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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (6)

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7. Fold Classification (SCOP + CATH) 12 domains

CATH v4.4 (12 domains)

Domain ID domain_id3s9nA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology630 — Aminopeptidase
Homologous superfamily homologous superfamily10 — Zn peptidases
Domain ID domain_id3s9nA02
Class class3 — Alpha Beta
Architecture architecture50 — 3-Layer(bba) Sandwich
Topology topology30 — Glucose Oxidase; domain 1
Homologous superfamily homologous superfamily30 —
Domain ID domain_id3s9nA03
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology930 — Transcription Elongation Factor S-II; Chain A
Homologous superfamily homologous superfamily40 — Transferrin receptor-like, dimerisation domain
Domain ID domain_id3s9nB01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology630 — Aminopeptidase
Homologous superfamily homologous superfamily10 — Zn peptidases
Domain ID domain_id3s9nB02
Class class3 — Alpha Beta
Architecture architecture50 — 3-Layer(bba) Sandwich
Topology topology30 — Glucose Oxidase; domain 1
Homologous superfamily homologous superfamily30 —
Domain ID domain_id3s9nB03
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology930 — Transcription Elongation Factor S-II; Chain A
Homologous superfamily homologous superfamily40 — Transferrin receptor-like, dimerisation domain
Domain ID domain_id3s9nC01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id3s9nC02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id3s9nC03
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id3s9nD01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id3s9nD02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id3s9nD03
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
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8. Citations (1)

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9. Files and Curves (10)