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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：P03775 New Search
11PDB entries
13Biological 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
1S7Z Structure of Ocr from Bacteriophage T7 Deposited 2004-01-30 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–117（117 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CS CESIUM ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.2；291 K；32%PEG-8000, 0.1M Tris-HCl, 0.2M caesium chloride, pH 8.2, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 1.83 Å R-free 0.239
1S7Z Structure of Ocr from Bacteriophage T7 Deposited 2004-01-30 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–117（117 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CS CESIUM ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.2；291 K；32%PEG-8000, 0.1M Tris-HCl, 0.2M caesium chloride, pH 8.2, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 1.83 Å R-free 0.239
1S7Z Structure of Ocr from Bacteriophage T7 Deposited 2004-01-30 Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–117（117 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CS CESIUM ION × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.2；291 K；32%PEG-8000, 0.1M Tris-HCl, 0.2M caesium chloride, pH 8.2, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 1.83 Å R-free 0.239
2Y7C Atomic model of the Ocr-bound methylase complex from the Type I restriction-modification enzyme EcoKI (M2S1). Based on fitting into EM map 1534. Deposited 2011-01-31 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain D 1–116（116 aa）
Chain E 1–116（116 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer 20MM TRIS-CL, 100 MM NACL；pH 4.7；20MM TRIS-CL, 100 MM NACL
Resolution 18.00 Å
6R9B Cryo-EM structure of bacterial RNAP with a DNA mimic protein Ocr from T7 phage Deposited 2019-04-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 7 PDB declaration: heptameric（7） Consistent with protein count
Chain F 1–117（117 aa）
Chain G 1–117（117 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.80 Å
6R9G Structural basis of transcription inhibition by the DNA mimic Ocr protein of bacteriophage T7 Deposited 2019-04-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 7 PDB declaration: heptameric（7） Consistent with protein count
Chain F 1–117（117 aa）
Chain G 1–117（117 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.70 Å
7BST EcoR124I-Ocr in the Intermediate State Deposited 2020-03-31 Assembly 1 Protein heterocomplex Heteromer；Protein × 7 PDB declaration: heptameric（7） Consistent with protein count
Chain F 1–117（117 aa）
Chain G 1–117（117 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.37 Å
7BTP EcoR124I-Ocr in Restriction-Alleviation State Deposited 2020-04-02 Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain D 1–117（117 aa）
Chain F 1–117（117 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.01 Å
7EEW Crystal structure of the intact MTase from Vibrio vulnificus YJ016 in complex with the DNA-mimicking Ocr protein and the S-adenosyl-L-homocysteine (SAH) Deposited 2021-03-19 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 1–117（117 aa）
Not recorded SAH S-ADENOSYL-L-HOMOCYSTEINE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；293 K；20% (w/v) polyethylene glycol 6000, 0.1 M sodium chloride, 0.1 M HEPES pH 8.5
Resolution 2.90 Å R-free 0.293
8Q56 PglX methyltransferase of Salmonella BREX phage defence system (aka BrxX) bound to inhibitor Ocr Deposited 2023-08-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 1–117（117 aa）
Not recorded SAM S-ADENOSYLMETHIONINE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.2；293 K；0.1 M NaCl, 0.1 M KCl, 14% PEG 4000, 6% MPD
Resolution 3.50 Å R-free 0.292
8V45 CryoEM structure of AriA-Ocr complex Deposited 2023-11-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain O 1–117（117 aa）
Chain P 1–117（117 aa）
Not recorded ATP ADENOSINE-5'-TRIPHOSPHATE × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.63 Å
8ZEK Cryo-EM structure of the E. coli BrxX methyltransferase complexed with Ocr Deposited 2024-05-06 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain B 1–117（117 aa）
Chain C 1–117（117 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.15 Å
9EX7 Cryo-EM structure of the E. coli BrxX methyltransferase in complex with Ocr Deposited 2024-04-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–117（117 aa）
Chain D 1–117（117 aa）
Not recorded MG MAGNESIUM ION × 2 SAM S-ADENOSYLMETHIONINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.91 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.