1JXQ

Structure of cleaved, CARD domain deleted Caspase-9


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Dimer formation drives the activation of the cell death protease caspase 9.

Renatus, M.Stennicke, H.R.Scott, F.L.Liddington, R.C.Salvesen, G.S.

(2001) Proc.Natl.Acad.Sci.USA 98: 14250-14255

  • DOI: 10.1073/pnas.231465798

  • PubMed Abstract: 
  • A critical step in the induction of apoptosis is the activation of the apoptotic initiator caspase 9. We show that at its normal physiological concentration, caspase 9 is primarily an inactive monomer (zymogen), and that activity is associated with a ...

    A critical step in the induction of apoptosis is the activation of the apoptotic initiator caspase 9. We show that at its normal physiological concentration, caspase 9 is primarily an inactive monomer (zymogen), and that activity is associated with a dimeric species. At the high concentrations used for crystal formation, caspase 9 is dimeric, and the structure reveals two very different active-site conformations within each dimer. One site closely resembles the catalytically competent sites of other caspases, whereas in the second, expulsion of the "activation loop" disrupts the catalytic machinery. We propose that the inactive domain resembles monomeric caspase 9. Activation is induced by dimerization, with interactions at the dimer interface promoting reorientation of the activation loop. These observations support a model in which recruitment by Apaf-1 creates high local concentrations of caspase 9 to provide a pathway for dimer-induced activation.


    Organizational Affiliation

    Program in Apoptosis and Cell Death Research, The Burnham Institute, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-9
A, B, C, D
284Homo sapiensGene Names: CASP9 (MCH6)
EC: 3.4.22.62
Find proteins for P55211 (Homo sapiens)
Go to Gene View: CASP9
Go to UniProtKB:  P55211
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
benzoxycarbonyl-Val-Ala-Asp-fluoromethyl ketone Inhibitor
E, F
5N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
PHQ
Query on PHQ
E, F
NON-POLYMERC8 H7 Cl O2

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CF0
Query on CF0
E, F
NON-POLYMERC H3 F

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.233 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 144.300α = 90.00
b = 81.800β = 111.70
c = 125.400γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
AMoREphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-12-12
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance