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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：P55211 New Search
8PDB entries
17Biological assembly
26chain/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
1NW9 STRUCTURE OF CASPASE-9 IN AN INHIBITORY COMPLEX WITH XIAP-BIR3 Deposited 2003-02-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 140–416（277 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；293 K；Tris, potassium phosphate, pH 8, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.40 Å R-free 0.235
2AR9 Crystal structure of a dimeric caspase-9 Deposited 2005-08-19 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 140–416（277 aa） Fragment：residues 140-416
Chain B 140–416（277 aa） Fragment：residues 140-416
Mutation：C287S, G402C, C403I, F404V, N405S, F406M Mutation：C287S, G402C, C403I, F404V, N405S, F406M MLT D-MALATE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；290 K；PEG5000 monomethylether, MES, tacsimate, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.80 Å R-free 0.288
2AR9 Crystal structure of a dimeric caspase-9 Deposited 2005-08-19 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 140–416（277 aa） Fragment：residues 140-416
Chain D 140–416（277 aa） Fragment：residues 140-416
Mutation：C287S, G402C, C403I, F404V, N405S, F406M Mutation：C287S, G402C, C403I, F404V, N405S, F406M No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；290 K；PEG5000 monomethylether, MES, tacsimate, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.80 Å R-free 0.288
3D9T CIAP1-BIR3 in complex with N-terminal peptide from Caspase-9 (ATPFQE) Deposited 2008-05-27 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 316–321（6 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；3.1M NA FORMATE,10% GLYCEROL,1.5MM PEPTIDE, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 1.50 Å R-free 0.205
3D9T CIAP1-BIR3 in complex with N-terminal peptide from Caspase-9 (ATPFQE) Deposited 2008-05-27 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 316–321（6 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；3.1M NA FORMATE,10% GLYCEROL,1.5MM PEPTIDE, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 1.50 Å R-free 0.205
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain E 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 4 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain G 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 5 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain I 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 6 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain K 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 7 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain M 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3V3K Human caspase 9 in complex with bacterial effector protein Deposited 2011-12-13 Assembly 8 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain O 141–416（276 aa） Fragment：UNP Residues 141-416
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；293 K；0.75 K-Na-Tartrate, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.49 Å R-free 0.259
3YGS APAF-1 CARD IN COMPLEX WITH PRODOMAIN OF PROCASPASE-9 Deposited 1999-05-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain P 1–96（96 aa） Fragment：PRODOMAIN
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 7.5；pH 7.5
Resolution 2.50 Å R-free 0.299
4RHW Crystal structure of Apaf-1 CARD and caspase-9 CARD complex Deposited 2014-10-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain E 1–100（100 aa） Fragment：card domain
Chain F 1–100（100 aa） Fragment：card domain
Not recorded SO4 SULFATE ION × 7 CL CHLORIDE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；291 K；13% PEG 3000, 0.2M ammonium sulfate, 0.1M MES (pH5.5), VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.10 Å R-free 0.226
5JUY Active human apoptosome with procaspase-9 Deposited 2016-05-10 Assembly 1 Protein heterocomplex Heteromer；Protein × 18 PDB declaration: octadecameric（18） Consistent with protein count
Chain O 1–95（95 aa） Fragment：N-terminal caspase recognition domain
Chain P 1–95（95 aa） Fragment：N-terminal caspase recognition domain
Chain Q 1–95（95 aa） Fragment：N-terminal caspase recognition domain
Chain R 1–95（95 aa） Fragment：N-terminal caspase recognition domain
Not recorded DTP 2'-DEOXYADENOSINE 5'-TRIPHOSPHATE × 7 HEC HEME C × 7 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；Buffer A
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.10 Å
9R44 Crystal structure of human caspase-9 CARD Deposited 2025-05-07 Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 1–99（99 aa）
Chain E 1–99（99 aa）
Chain H 1–99（99 aa）
Chain L 1–99（99 aa）
Not recorded SO4 SULFATE ION × 18 CL CHLORIDE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；289 K；1.5 M Lithium sulfate, 0.1 M Sodium HEPES, and pH 7.5 Protein concentration: 15 mg/ml Buffer in: 20 mM Hepes, 50 mM NaCl, 2 mM TCEP, and pH 7.5
Resolution 2.46 Å R-free 0.265

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.