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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：P68187 New Search
14PDB entries
24Biological assembly
46chain/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
1Q12 Crystal Structure of the ATP-bound E. coli MalK Deposited 2003-07-18 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded ATP ADENOSINE-5'-TRIPHOSPHATE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.8；273 K；PEG 4000, glycerol, Sodium Acetate, Tris, pH 8.8, VAPOR DIFFUSION, HANGING DROP, temperature 273K
Resolution 2.60 Å R-free 0.286
1Q12 Crystal Structure of the ATP-bound E. coli MalK Deposited 2003-07-18 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 1–371（371 aa）
Chain D 1–371（371 aa）
Not recorded ATP ADENOSINE-5'-TRIPHOSPHATE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.8；273 K；PEG 4000, glycerol, Sodium Acetate, Tris, pH 8.8, VAPOR DIFFUSION, HANGING DROP, temperature 273K
Resolution 2.60 Å R-free 0.286
1Q1B Crystal structure of E. coli MalK in the nucleotide-free form Deposited 2003-07-18 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.8；293 K；PEG 4000, glycerol, Sodium Acetate, Tris, pH 8.8, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.80 Å R-free 0.304
1Q1B Crystal structure of E. coli MalK in the nucleotide-free form Deposited 2003-07-18 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 1–371（371 aa）
Chain D 1–371（371 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.8；293 K；PEG 4000, glycerol, Sodium Acetate, Tris, pH 8.8, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.80 Å R-free 0.304
1Q1E The ATPase component of E. coli maltose transporter (MalK) in the nucleotide-free form Deposited 2003-07-19 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；PEG5K MME, (NH4)2SO4, MES, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.90 Å R-free 0.276
2AWN Crystal structure of the ADP-Mg-bound E. Coli MALK (Crystallized with ATP-Mg) Deposited 2005-09-01 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5mM ATP-Mg2+, 0.2M Magnesium Formate, 15%~20% PEG3350, 15% Glycerol , VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.30 Å R-free 0.271
2AWN Crystal structure of the ADP-Mg-bound E. Coli MALK (Crystallized with ATP-Mg) Deposited 2005-09-01 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 1–371（371 aa）
Chain D 1–371（371 aa）
Not recorded MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5mM ATP-Mg2+, 0.2M Magnesium Formate, 15%~20% PEG3350, 15% Glycerol , VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.30 Å R-free 0.271
2AWO Crystal structure of the ADP-Mg-bound E. Coli MALK (Crystallized with ADP-Mg) Deposited 2005-09-01 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5mM ADP-Mg2+, 0.2M Magnesium Formate, 15%~20% PEG3350, 15% Glycerol, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.80 Å R-free 0.277
2AWO Crystal structure of the ADP-Mg-bound E. Coli MALK (Crystallized with ADP-Mg) Deposited 2005-09-01 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 1–371（371 aa）
Chain D 1–371（371 aa）
Not recorded MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；5mM ADP-Mg2+, 0.2M Magnesium Formate, 15%~20% PEG3350, 15% Glycerol, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.80 Å R-free 0.277
3FH6 Crystal structure of the resting state maltose transporter from E. coli Deposited 2008-12-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；11.5 % PEG 4000, 0.1M ADA pH 6.5, 0.1 M NaCl, 0.1 M Li2SO4, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 4.50 Å R-free 0.363
3FH6 Crystal structure of the resting state maltose transporter from E. coli Deposited 2008-12-08 Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–371（371 aa）
Chain D 1–371（371 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；11.5 % PEG 4000, 0.1M ADA pH 6.5, 0.1 M NaCl, 0.1 M Li2SO4, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 4.50 Å R-free 0.363
3GD7 Crystal structure of human NBD2 complexed with N6-Phenylethyl-ATP (P-ATP) Deposited 2009-02-23 Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain D 219–371（153 aa）
Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D B44 N-(2-phenylethyl)adenosine 5'-(tetrahydrogen triphosphate) × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；277 K；1.1-1.25 M tri-sodium citrate, pH 5.5-8, sitting drop, temperature 277K, VAPOR DIFFUSION
Resolution 2.70 Å R-free 0.308
3GD7 Crystal structure of human NBD2 complexed with N6-Phenylethyl-ATP (P-ATP) Deposited 2009-02-23 Assembly 2 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 219–371（153 aa）
Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D B44 N-(2-phenylethyl)adenosine 5'-(tetrahydrogen triphosphate) × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；277 K；1.1-1.25 M tri-sodium citrate, pH 5.5-8, sitting drop, temperature 277K, VAPOR DIFFUSION
Resolution 2.70 Å R-free 0.308
3GD7 Crystal structure of human NBD2 complexed with N6-Phenylethyl-ATP (P-ATP) Deposited 2009-02-23 Assembly 3 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 219–371（153 aa）
Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D B44 N-(2-phenylethyl)adenosine 5'-(tetrahydrogen triphosphate) × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；277 K；1.1-1.25 M tri-sodium citrate, pH 5.5-8, sitting drop, temperature 277K, VAPOR DIFFUSION
Resolution 2.70 Å R-free 0.308
3GD7 Crystal structure of human NBD2 complexed with N6-Phenylethyl-ATP (P-ATP) Deposited 2009-02-23 Assembly 4 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain C 219–371（153 aa）
Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D B44 N-(2-phenylethyl)adenosine 5'-(tetrahydrogen triphosphate) × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；277 K；1.1-1.25 M tri-sodium citrate, pH 5.5-8, sitting drop, temperature 277K, VAPOR DIFFUSION
Resolution 2.70 Å R-free 0.308
3GD7 Crystal structure of human NBD2 complexed with N6-Phenylethyl-ATP (P-ATP) Deposited 2009-02-23 Assembly 5 Insufficient information Homooligomer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 219–371（153 aa）
Chain B 219–371（153 aa）
Chain C 219–371（153 aa）
Chain D 219–371（153 aa）
Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D Mutation：Q1280E, Y1307N, E1308A, Q1309A, W1310H, H1402A, Q1411D B44 N-(2-phenylethyl)adenosine 5'-(tetrahydrogen triphosphate) × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；277 K；1.1-1.25 M tri-sodium citrate, pH 5.5-8, sitting drop, temperature 277K, VAPOR DIFFUSION
Resolution 2.70 Å R-free 0.308
3PUV Crystal Structure of an outward-facing MBP-Maltose transporter complex bound to ADP-VO4 Deposited 2010-12-06 Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded PGV (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 10 UMQ UNDECYL-MALTOSIDE × 1 MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 VO4 VANADATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；27% PEG 400, 0.1M HEPES, 10 mM magnesium chloride, 50 mM sodium chloride, VAPOR DIFFUSION, SITTING DROP, temperature 293K, pH 7.5
Resolution 2.40 Å R-free 0.253
3PUW Crystal Structure of an outward-facing MBP-Maltose transporter complex bound to ADP-AlF4 Deposited 2010-12-06 Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded PGV (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 10 UMQ UNDECYL-MALTOSIDE × 1 MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 ALF TETRAFLUOROALUMINATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；27 % PEG 400, 0.1 M HEPES, 10 mM magnesium chloride, 50 mM sodium chloride, VAPOR DIFFUSION, SITTING DROP, temperature 293K, pH 7.5
Resolution 2.30 Å R-free 0.255
3PUX Crystal Structure of an outward-facing MBP-Maltose transporter complex bound to ADP-BeF3 Deposited 2010-12-06 Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded UMQ UNDECYL-MALTOSIDE × 1 PGV (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 10 MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 BEF BERYLLIUM TRIFLUORIDE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions pH 7.5；293 K；27% PEG 400, 0.1 M HEPES, 10 mM magnesium chloride, 50 mM sodium chloride, VAPOR DIFFUSION, SITTING DROP, temperature 293K, pH 7.5
Resolution 2.30 Å R-free 0.265
3RLF Crystal structure of the maltose-binding protein/maltose transporter complex in an outward-facing conformation bound to MgAMPPNP Deposited 2011-04-19 Assembly 1 Other combination Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded UMQ UNDECYL-MALTOSIDE × 1 PGV (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 4 MG MAGNESIUM ION × 2 ANP PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；293 K；28% PEG 4000, 0.1M sodium hepes pH 7.5, 0.2M sodium chloride, 0.05M magnesium chloride, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.20 Å R-free 0.254
4JBW Crystal structure of E. coli maltose transporter MalFGK2 in complex with its regulatory protein EIIAglc Deposited 2013-02-20 Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain A 1–371（371 aa）
Chain B 1–371（371 aa）
Not recorded PGV (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.6；295 K；13% PEG monomethylether 2000, 100mM Sodium cacodylate pH 5.6, 100mM Non Detergent Sulfobetaine (NDSB-256), VAPOR DIFFUSION, SITTING DROP, temperature 295K
Resolution 3.91 Å R-free 0.281
4JBW Crystal structure of E. coli maltose transporter MalFGK2 in complex with its regulatory protein EIIAglc Deposited 2013-02-20 Assembly 2 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain C 1–371（371 aa）
Chain D 1–371（371 aa）
Not recorded PGV (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.6；295 K；13% PEG monomethylether 2000, 100mM Sodium cacodylate pH 5.6, 100mM Non Detergent Sulfobetaine (NDSB-256), VAPOR DIFFUSION, SITTING DROP, temperature 295K
Resolution 3.91 Å R-free 0.281
9BCR Cryo-EM structure of a bacterial prototype ATP-binding cassette transporter MalFGK2. Deposited 2024-04-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 2–371（370 aa）
Chain D 2–371（370 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.26 Å
9NQJ Cryo-EM structure of a bacterial prototype ATP-binding cassette transporter MalFGK2. Deposited 2025-03-12 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 2–371（370 aa）
Chain B 2–371（370 aa）
Not recorded MG MAGNESIUM ION × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 2 VO4 VANADATE ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.34 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.