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Protein Structures and Oligomeric States

Enter a protein name, UniProt accession or PDB ID. Name searches ask you to confirm the protein identity before related structures are queried.

Current Protein Identity：P30101 New Search
8PDB entries
14Biological assembly
15chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different assembly state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics

Difference tags compare only the current result set; every original PDB and assembly record remains separate.

Related-Structure Differences

Each row represents one biological assembly in one PDB entry; multiple monomers of the same protein are listed separately.

PDB Entry Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Experimental Method Experimental Conditions Structure Quality
2ALB NMR structure of the N-terminal domain a of the glycoprotein chaperone ERp57 Deposited 2005-08-05 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 25–137（113 aa）
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 6.3；298 K；Ionic strength (raw mmCIF value) 0.8-2.5 mM
Resolution not provided
2DMM The solution structure of the second thioredoxin domain of human Protein disulfide-isomerase A3 Deposited 2006-04-22 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 357–485（129 aa） Fragment：thioredoxin domain
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 7；296 K；Ionic strength (raw mmCIF value) 120mM；Pressure ambient
NMR sample composition 1.3mM thioredoxin domain U-15N,13C; 20mM d-Tris-HCl; 100mM NaCl; 1mM d-DTT; 0.02% NaN3; 10% D2O | 90% H2O/10% D2O
Resolution not provided
2H8L Crystal structure of the bb' fragment of ERp57 Deposited 2006-06-07 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 134–376（243 aa） Fragment：;bb' fragment ;
Non-standard monomer：Yes (specific site not provided by mmCIF) No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；30% PEG 3350, 0.1M ammonium sulphate, 0.1M HEPES, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.00 Å R-free 0.250
2H8L Crystal structure of the bb' fragment of ERp57 Deposited 2006-06-07 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 134–376（243 aa） Fragment：;bb' fragment ;
Non-standard monomer：Yes (specific site not provided by mmCIF) No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；30% PEG 3350, 0.1M ammonium sulphate, 0.1M HEPES, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.00 Å R-free 0.250
2H8L Crystal structure of the bb' fragment of ERp57 Deposited 2006-06-07 Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain C 134–376（243 aa） Fragment：;bb' fragment ;
Non-standard monomer：Yes (specific site not provided by mmCIF) No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；30% PEG 3350, 0.1M ammonium sulphate, 0.1M HEPES, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.00 Å R-free 0.250
3F8U Tapasin/ERp57 heterodimer Deposited 2008-11-13 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 25–505（481 aa）
Mutation：C60A NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；295 K；reservoir contained 100 mM HEPES (@pH 7.5), 20% PEG 3K, 200 mM CaCl2. protein was concentrated to 10mg/ml in 150 mM NaCl, 20 mM Tris (@ pH 7.4), 5% glycerol. The hanging drop was supplemented to contain 100 mM guanidine HCl; seeding was used to obtain larger crystals., VAPOR DIFFUSION, HANGING DROP, temperature 295K
Resolution 2.60 Å R-free 0.285
3F8U Tapasin/ERp57 heterodimer Deposited 2008-11-13 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 25–505（481 aa）
Mutation：C60A NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；295 K；reservoir contained 100 mM HEPES (@pH 7.5), 20% PEG 3K, 200 mM CaCl2. protein was concentrated to 10mg/ml in 150 mM NaCl, 20 mM Tris (@ pH 7.4), 5% glycerol. The hanging drop was supplemented to contain 100 mM guanidine HCl; seeding was used to obtain larger crystals., VAPOR DIFFUSION, HANGING DROP, temperature 295K
Resolution 2.60 Å R-free 0.285
3F8U Tapasin/ERp57 heterodimer Deposited 2008-11-13 Assembly 3 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 25–505（481 aa）
Chain C 25–505（481 aa）
Mutation：C60A Mutation：C60A NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；295 K；reservoir contained 100 mM HEPES (@pH 7.5), 20% PEG 3K, 200 mM CaCl2. protein was concentrated to 10mg/ml in 150 mM NaCl, 20 mM Tris (@ pH 7.4), 5% glycerol. The hanging drop was supplemented to contain 100 mM guanidine HCl; seeding was used to obtain larger crystals., VAPOR DIFFUSION, HANGING DROP, temperature 295K
Resolution 2.60 Å R-free 0.285
6ENY Structure of the human PLC editing module Deposited 2017-10-07 Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain D 25–505（481 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 5.80 Å
7QNG Structure of a MHC I-Tapasin-ERp57 complex Deposited 2021-12-20 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 1–505（505 aa）
Mutation：C60A No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；291.15 K；100 mM Gly-Gly, AMPD, pH 8.5, 300 mM lithium sulfate, 300 mM sodium sulfate, 300 mM potassium sulfate, 20% (v/v) PEG8000, 40% (v/v) 1,5-pentanediol
Resolution 2.70 Å R-free 0.229
7QPD Structure of the human MHC I peptide-loading complex editing module Deposited 2022-01-03 Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain E 25–505（481 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.73 Å
9WQU b-b' domain fragment of ER-60 (ERp57) under microgravity Deposited 2025-09-11 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 134–376（243 aa）
Not recorded SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions COUNTER-DIFFUSION；pH 7；293 K；50 mM HEPES-NaOH, pH 7.0, 20% PEG3350, 50 mM Ammonium Sulfate, 100 m M NaCl, 0.04% NaN3
Resolution 1.80 Å R-free 0.263
9WQU b-b' domain fragment of ER-60 (ERp57) under microgravity Deposited 2025-09-11 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 134–376（243 aa）
Not recorded SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions COUNTER-DIFFUSION；pH 7；293 K；50 mM HEPES-NaOH, pH 7.0, 20% PEG3350, 50 mM Ammonium Sulfate, 100 m M NaCl, 0.04% NaN3
Resolution 1.80 Å R-free 0.263
9WQU b-b' domain fragment of ER-60 (ERp57) under microgravity Deposited 2025-09-11 Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain C 134–376（243 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions COUNTER-DIFFUSION；pH 7；293 K；50 mM HEPES-NaOH, pH 7.0, 20% PEG3350, 50 mM Ammonium Sulfate, 100 m M NaCl, 0.04% NaN3
Resolution 1.80 Å R-free 0.263

This page presents structural evidence recorded in PDB/mmCIF.“No recorded non-water small molecule” does not prove that the experimental sample was ligand-free; experimental conditions belong to the PDB experiment, while ligands and copy counts are shown for each biological assembly.