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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：Q9A8S9 New Search
5PDB entries
9Biological assembly
13chain/assembly records
Main Difference Dimensions in This Set
Different construct 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
9PFQ The cryo-EM structure of C. crescentus DriD-ssDNA-RNAP-Sigma73-bapE promoter transcription activation complex Deposited 2025-07-06 Assembly 1 Protein–DNA Heteromer；Protein × 8 PDB declaration: 12-meric（12） Consistent with all polymers
Chain A 1–338（338 aa）
Chain B 1–338（338 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；20 mM Tris-cl, 5 mM MgCl2, 100 mM NaCl, 1 mM BME
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.24 Å
9PFV The cryo-EM structure of C. crescentus DriD-ssDNA-RNAP-Sigma73-CCNA_03891/CCNA_01149 promoter transcription activation complex Deposited 2025-07-06 Assembly 1 Protein–DNA Heteromer；Protein × 8 PDB declaration: dodecameric（12） Consistent with all polymers
Chain A 1–338（338 aa）
Chain B 1–338（338 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；20 mM Tris-cl, 5 mM MgCl2, 100 mM NaCl, 1 mM BME
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.70 Å
9PGA The cryo-EM structure of C. crescentus DriD-ssDNA-RNAP-Sigma73-didA promoter transcription activation complex Deposited 2025-07-07 Assembly 1 Protein–DNA Heteromer；Protein × 8 PDB declaration: 12-meric（12） Consistent with all polymers
Chain A 1–338（338 aa）
Chain B 1–338（338 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；20 mM Tris-cl, 5 mM MgCl2, 100 mM NaCl, 1 mM BME
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.98 Å
9PGH The cryo-EM structure of C. crescentus RNAP-Sigma73-CCNA_03891/CCNA_01149 promoter complex Deposited 2025-07-07 Assembly 1 Protein–DNA Heteromer；Protein × 6 PDB declaration: octameric（8） Consistent with all polymers
Chain A 1–338（338 aa）
Chain B 1–338（338 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；20 mM Tris-cl, 5 mM MgCl2, 100 mM NaCl, 1 mM BME
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.54 Å
9ZUM Structure of the Caulobacter crescentus RNAP alpha-CTD bound to AT rich DNA Deposited 2025-12-24 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 251–329（79 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；1-2% PEG 2000 MME, 1 mM Ammonium sulphate, 20 mM sodium acetate pH 5.5
Resolution 2.43 Å R-free 0.242
9ZUM Structure of the Caulobacter crescentus RNAP alpha-CTD bound to AT rich DNA Deposited 2025-12-24 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 251–329（79 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；1-2% PEG 2000 MME, 1 mM Ammonium sulphate, 20 mM sodium acetate pH 5.5
Resolution 2.43 Å R-free 0.242
9ZUM Structure of the Caulobacter crescentus RNAP alpha-CTD bound to AT rich DNA Deposited 2025-12-24 Assembly 3 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric（3） Consistent with all polymers
Chain C 251–329（79 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；1-2% PEG 2000 MME, 1 mM Ammonium sulphate, 20 mM sodium acetate pH 5.5
Resolution 2.43 Å R-free 0.242
9ZUM Structure of the Caulobacter crescentus RNAP alpha-CTD bound to AT rich DNA Deposited 2025-12-24 Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain D 251–329（79 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；1-2% PEG 2000 MME, 1 mM Ammonium sulphate, 20 mM sodium acetate pH 5.5
Resolution 2.43 Å R-free 0.242
9ZUM Structure of the Caulobacter crescentus RNAP alpha-CTD bound to AT rich DNA Deposited 2025-12-24 Assembly 5 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain E 251–329（79 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；1-2% PEG 2000 MME, 1 mM Ammonium sulphate, 20 mM sodium acetate pH 5.5
Resolution 2.43 Å R-free 0.242

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.