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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：P02920 New Search
14PDB entries
18Biological assembly
21chain/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
1PV6 Crystal structure of lactose permease Deposited 2003-06-26 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–417（417 aa）
Mutation：C154G No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；PEG 400, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.50 Å R-free 0.337
1PV6 Crystal structure of lactose permease Deposited 2003-06-26 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 1–417（417 aa）
Mutation：C154G No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；PEG 400, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.50 Å R-free 0.337
1PV7 Crystal structure of lactose permease with TDG Deposited 2003-06-26 Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–417（417 aa）
Mutation：C154G No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；PEG 400, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.60 Å R-free 0.296
1PV7 Crystal structure of lactose permease with TDG Deposited 2003-06-26 Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 1–417（417 aa）
Mutation：C154G No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；PEG 400, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.60 Å R-free 0.296
2CFP Sugar Free Lactose Permease at acidic pH Deposited 2006-02-22 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–417（417 aa）
Mutation：YES HG MERCURY (II) ION × 5 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 3.30 Å R-free 0.328
2CFQ Sugar Free Lactose Permease at neutral pH Deposited 2006-02-22 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–417（417 aa）
Mutation：YES HG MERCURY (II) ION × 5 X-RAY DIFFRACTION
X-ray crystallization conditions pH 6.5；pH 6.50
Resolution 2.95 Å R-free 0.298
2V8N Wild-type Structure of Lactose Permease Deposited 2007-08-09 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–417（417 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 8；pH 8.0
Resolution 3.60 Å R-free 0.333
2V8N Wild-type Structure of Lactose Permease Deposited 2007-08-09 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 1–417（417 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 8；pH 8.0
Resolution 3.60 Å R-free 0.333
2Y5Y Crystal structure of LacY in complex with an affinity inactivator Deposited 2011-01-19 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–417（417 aa）
Chain B 1–417（417 aa）
Mutation：YES Mutation：YES BA BARIUM ION × 2 TGA 2-sulfanylethyl beta-D-galactopyranoside × 2 X-RAY DIFFRACTION
X-ray crystallization conditions pH 6；PH 6
Resolution 3.38 Å R-free 0.303
4ZYR Crystal structure of E. coli Lactose permease G46W/G262W bound to p-nitrophenyl alpha-D-galactopyranoside (alpha-NPG) Deposited 2015-05-22 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–417（417 aa）
Mutation：G46W, G262W 9PG 4-nitrophenyl alpha-D-galactopyranoside × 1 BNG nonyl beta-D-glucopyranoside × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；295 K；1.0 M NaCl 0.05 M Tris (pH8.0) 26% PEG 600
Resolution 3.31 Å R-free 0.278
4ZYR Crystal structure of E. coli Lactose permease G46W/G262W bound to p-nitrophenyl alpha-D-galactopyranoside (alpha-NPG) Deposited 2015-05-22 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 1–417（417 aa）
Mutation：G46W, G262W 9PG 4-nitrophenyl alpha-D-galactopyranoside × 1 BNG nonyl beta-D-glucopyranoside × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；295 K；1.0 M NaCl 0.05 M Tris (pH8.0) 26% PEG 600
Resolution 3.31 Å R-free 0.278
5GXB crystal structure of a LacY/Nanobody complex Deposited 2016-09-16 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–417（417 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions LIPIDIC CUBIC PHASE；293 K；100mM MES pH 6.0, 100mM (NH4)2C4H4O6, 43% PEG 400
Resolution 3.30 Å R-free 0.346
6C9W Crystal Structure of a ligand bound LacY/Nanobody Complex Deposited 2018-01-29 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–417（417 aa） Fragment：Full
Mutation：G46W, G262W 9PG 4-nitrophenyl alpha-D-galactopyranoside × 1 BNG nonyl beta-D-glucopyranoside × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 8.5；295 K；0.1 M MgCl2, 28% PEG1000, 0.1 M Tris-HCl, pH 8.5
Resolution 3.00 Å R-free 0.295
8Y9Y Structure of the SecA-SecY complex with the substrate FtsQ-LacY(+1C) Deposited 2024-02-07 Assembly 1 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 315–334（20 aa）
Mutation：T1M,R2A,L3K,A4K,G5T,C53A MG MAGNESIUM ION × 1 BEF BERYLLIUM TRIFLUORIDE ION × 1 ADP ADENOSINE-5'-DIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.29 Å
8YA0 Structure of the SecA-SecY complex with the substrate FtsQ-LacY(+7C) Deposited 2024-02-07 Assembly 1 Insufficient information Heteromer；Protein × 7 PDB declaration: heptameric（7） Consistent with protein count
Chain B 316–332（17 aa）
Mutation：R2A, L3K, A4K, G5T, C14T, F17L MG MAGNESIUM ION × 1 BEF BERYLLIUM TRIFLUORIDE ION × 1 ADP ADENOSINE-5'-DIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.97 Å
8YA2 Structure of the SecA-SecY complex with the substrate FtsQ-LacY(+20C) Deposited 2024-02-07 Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain B 315–334（20 aa）
Mutation：T1M,R2A,L3K,A4K,G5T,E45C,C53A MG MAGNESIUM ION × 1 BEF BERYLLIUM TRIFLUORIDE ION × 1 ADP ADENOSINE-5'-DIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.84 Å
8YA3 Structure of the SecA-SecY complex with the substrate FtsQ-LacY(+7C) treated with DTT Deposited 2024-02-07 Assembly 1 Insufficient information Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain B 315–334（20 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.27 Å
9XOU CryoEM structure of LacY with Trimbody Deposited 2025-11-15 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain G 1–417（417 aa）
Chain H 1–417（417 aa）
Chain I 1–417（417 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.50 Å

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.