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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：Q9L4P2 New Search
24PDB entries
25Biological assembly
25chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different ligand/ion 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
4JF4 OXA-23 meropenem complex Deposited 2013-02-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–273（243 aa）
Not recorded EDO 1,2-ETHANEDIOL × 1 MER (4R,5S)-3-{[(3S,5S)-5-(dimethylcarbamoyl)pyrrolidin-3-yl]sulfanyl}-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-4-methyl-4,5-d ihydro-1H-pyrrole-2-carboxylic acid × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.1；277 K；0.06 M citric acid/0.04 M bis-tris propane, 16 % PEG3350, pH 4.1, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 2.14 Å R-free 0.254
4JF4 OXA-23 meropenem complex Deposited 2013-02-27 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 31–273（243 aa）
Not recorded MER (4R,5S)-3-{[(3S,5S)-5-(dimethylcarbamoyl)pyrrolidin-3-yl]sulfanyl}-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-4-methyl-4,5-d ihydro-1H-pyrrole-2-carboxylic acid × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.1；277 K；0.06 M citric acid/0.04 M bis-tris propane, 16 % PEG3350, pH 4.1, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 2.14 Å R-free 0.254
4JF5 Structure of OXA-23 at pH 4.1 Deposited 2013-02-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–273（243 aa）
Not recorded FLC CITRATE ANION × 1 EDO 1,2-ETHANEDIOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.1；277 K；0.06 M citric acid/0.04 M bis-tris propane, 16 % PEG3350, pH 4.1, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 1.15 Å R-free 0.162
4JF6 Structure of OXA-23 at pH 7.0 Deposited 2013-02-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–273（243 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) K POTASSIUM ION × 1 CL CHLORIDE ION × 4 PEG DI(HYDROXYETHYL)ETHER × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7；277 K；0.2 M succinic acid, 20% PEG3350, pH 7.0, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 2.50 Å R-free 0.285
4K0W X-ray crystal structure of OXA-23 A220 duplication clinical variant Deposited 2013-04-04 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–273（243 aa） Fragment：unp residues 31-273
Mutation：A220 insertion CIT CITRIC ACID × 1 EDO 1,2-ETHANEDIOL × 4 BCT BICARBONATE ION × 4 NA SODIUM ION × 5 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.2；296 K；0.2M sodium chloride, 0.1M phosphate, 0.1M citrate 20% w/v PEG 8000 , pH 4.2, VAPOR DIFFUSION, HANGING DROP, temperature 296K
Resolution 1.20 Å R-free 0.202
4K0X X-ray Crystal Structure of OXA-23 from Acinetobacter baumannii Deposited 2013-04-04 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–273（243 aa） Fragment：UNP residues 31-273
Non-standard monomer：Yes (specific site not provided by mmCIF) BCT BICARBONATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；296 K；5% w/v PGA-LM, 30% v/v PEG 550MME,0.1M Sodium acetate, OXA-23 in 50 mM sodium phosphate, VAPOR DIFFUSION, HANGING DROP, temperature 296K
Resolution 1.61 Å R-free 0.192
6N6T OXA-23 mutant F110A/M221A low pH form Deposited 2018-11-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–273（243 aa） Fragment：UNP residues 31-273
Mutation：F110A/M221A FLC CITRATE ANION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.1；293 K；0.06 M citric acid, 0.04 M bis-Tris propane, pH 4.1, 16% PEG3350
Resolution 1.25 Å R-free 0.180
6N6U OXA-23 mutant F110A/M221A low pH form imipenem complex Deposited 2018-11-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 32–273（242 aa） Fragment：UNP residues 32-273
Mutation：F110A/M221A ID1 Imipenem × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.1；293 K；0.06 M citric acid, 0.04 M bis-Tris propane, pH 4.1, 16% PEG3350
Resolution 1.55 Å R-free 0.196
6N6V OXA-23 mutant F110A/M221A low pH form meropenem complex Deposited 2018-11-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 32–273（242 aa） Fragment：UNP residues 32-273
Mutation：F110A/M221A KE1 meropenem, bound form × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 4.1；293 K；0.06 M citric acid, 0.04 M bis-Tris propane, pH 4.1, 16% PEG3350
Resolution 1.55 Å R-free 0.192
6N6W OXA-23 mutant F110A/M221A neutral pH form Deposited 2018-11-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 36–273（238 aa） Fragment：UNP residues 36-273
Mutation：F110A/M221A 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, SITTING DROP；pH 7；293 K；0.2 M succinic acid, pH 7.0, 20% PEG3350
Resolution 3.25 Å R-free 0.290
6N6X OXA-23 mutant F110A/M221A neutral pH form imipenem complex Deposited 2018-11-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 35–273（239 aa） Fragment：UNP residues 35-273
Mutation：F110A/M221A Non-standard monomer：Yes (specific site not provided by mmCIF) ID1 Imipenem × 1 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7；293 K；0.2 M succinic acid, pH 7.0, 20% PEG3350
Resolution 3.10 Å R-free 0.216
6N6Y OXA-23 mutant F110A/M221A neutral pH form meropenem complex Deposited 2018-11-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 35–273（239 aa） Fragment：UNP residues 35-273
Mutation：F110A/M221A Non-standard monomer：Yes (specific site not provided by mmCIF) KE1 meropenem, bound form × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7；293 K；0.2 M succinic acid, pH 7.0, 20% PEG3350
Resolution 3.50 Å R-free 0.300
9NSW apo-OXA-23, pH 7.5 Deposited 2025-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) SO4 SULFATE ION × 2 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.40 Å R-free 0.201
9NSX OXA-23-NA-1-157, 3 minute soak Deposited 2025-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) Y33 (5R)-3-{[(3S,5S)-5-(dimethylcarbamoyl)pyrrolidin-3-yl]sulfanyl}-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-5-methyl-4,5-dihydro-1H-pyrrole-2-carboxylic acid × 1 SO4 SULFATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.57 Å R-free 0.205
9NSY OXA-23-NA-1-157, 4 minute soak Deposited 2025-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) Y33 (5R)-3-{[(3S,5S)-5-(dimethylcarbamoyl)pyrrolidin-3-yl]sulfanyl}-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-5-methyl-4,5-dihydro-1H-pyrrole-2-carboxylic acid × 1 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.70 Å R-free 0.229
9NSZ OXA-23-NA-1-157, 6 minute soak Deposited 2025-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) Y33 (5R)-3-{[(3S,5S)-5-(dimethylcarbamoyl)pyrrolidin-3-yl]sulfanyl}-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-5-methyl-4,5-dihydro-1H-pyrrole-2-carboxylic acid × 1 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.80 Å R-free 0.200
9NT0 OXA-23-meropenem, pH 7.5 Deposited 2025-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MER (4R,5S)-3-{[(3S,5S)-5-(dimethylcarbamoyl)pyrrolidin-3-yl]sulfanyl}-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-4-methyl-4,5-d ihydro-1H-pyrrole-2-carboxylic acid × 1 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.60 Å R-free 0.202
9ZOP OXA-23-JDB/PQ-1-219, 3 min soak Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1 SO4 SULFATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.90 Å R-free 0.252
9ZOQ OXA-23-JDB/PQ-1-219, 5 min soak Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 2 SO4 SULFATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.65 Å R-free 0.234
9ZOR OXA-23-JDB/PQ-1-219, 10 min complex Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) A1C3I (2S)-2-[(1S,2R)-1-carboxy-2-hydroxypropyl]-4-{[(3S)-2,3-dihydroazet-3-yl]sulfanyl}-2-methyl-2H-pyrrole-5-carboxylic acid × 1 SO4 SULFATE ION × 2 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.65 Å R-free 0.200
9ZOS OXA-23-JDB/PQ-1-219, 20 min complex Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Not recorded A1C3I (2S)-2-[(1S,2R)-1-carboxy-2-hydroxypropyl]-4-{[(3S)-2,3-dihydroazet-3-yl]sulfanyl}-2-methyl-2H-pyrrole-5-carboxylic acid × 1 SO4 SULFATE ION × 3 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.60 Å R-free 0.229
9ZOT OXA-23-JDB/PQ-1-219, 30 min complex Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Not recorded MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1 A1C3I (2S)-2-[(1S,2R)-1-carboxy-2-hydroxypropyl]-4-{[(3S)-2,3-dihydroazet-3-yl]sulfanyl}-2-methyl-2H-pyrrole-5-carboxylic acid × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.75 Å R-free 0.198
9ZOU OXA-23-JDB/PQ-1-219, 40 min complex Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Not recorded A1C3I (2S)-2-[(1S,2R)-1-carboxy-2-hydroxypropyl]-4-{[(3S)-2,3-dihydroazet-3-yl]sulfanyl}-2-methyl-2H-pyrrole-5-carboxylic acid × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.50 Å R-free 0.207
9ZOV OXA-23-JDB/PQ-1-219, 60 min complex Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Not recorded CO2 CARBON DIOXIDE × 1 A1C3I (2S)-2-[(1S,2R)-1-carboxy-2-hydroxypropyl]-4-{[(3S)-2,3-dihydroazet-3-yl]sulfanyl}-2-methyl-2H-pyrrole-5-carboxylic acid × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.50 Å R-free 0.227
9ZOW OXA-23-JDB/PQ-1-219, 90 min complex Deposited 2025-12-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–273（273 aa）
Not recorded CO2 CARBON DIOXIDE × 1 A1C3I (2S)-2-[(1S,2R)-1-carboxy-2-hydroxypropyl]-4-{[(3S)-2,3-dihydroazet-3-yl]sulfanyl}-2-methyl-2H-pyrrole-5-carboxylic acid × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；0.2 M lithium sulfate, 0.1 M HEPES, pH 7.5, 25% PEG3350
Resolution 1.70 Å R-free 0.230

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.