3ITN

Crystal structure of Pseudo-activated Procaspase-3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A constitutively active and uninhibitable caspase-3 zymogen efficiently induces apoptosis.

Walters, J.Pop, C.Scott, F.L.Drag, M.Swartz, P.Mattos, C.Salvesen, G.S.Clark, A.C.

(2009) Biochem.J. 424: 335-345

  • DOI: 10.1042/BJ20090825

  • PubMed Abstract: 
  • The caspase-3 zymogen has essentially zero activity until it is cleaved by initiator caspases during apoptosis. However, a mutation of V266E in the dimer interface activates the protease in the absence of chain cleavage. We show that low concentratio ...

    The caspase-3 zymogen has essentially zero activity until it is cleaved by initiator caspases during apoptosis. However, a mutation of V266E in the dimer interface activates the protease in the absence of chain cleavage. We show that low concentrations of the pseudo-activated procaspase-3 kill mammalian cells rapidly and, importantly, this protein is not cleaved nor is it inhibited efficiently by the endogenous regulator XIAP (X-linked inhibitor of apoptosis). The 1.63 A (1 A = 0.1 nm) structure of the variant demonstrates that the mutation is accommodated at the dimer interface to generate an enzyme with substantially the same activity and specificity as wild-type caspase-3. Structural modelling predicts that the interface mutation prevents the intersubunit linker from binding in the dimer interface, allowing the active sites to form in the procaspase in the absence of cleavage. The direct activation of procaspase-3 through a conformational switch rather than by chain cleavage may lead to novel therapeutic strategies for inducing cell death.


    Organizational Affiliation

    Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, NC 27695, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-3
A
250Homo sapiensMutation(s): 0 
Gene Names: CASP3 (CPP32)
EC: 3.4.22.56
Find proteins for P42574 (Homo sapiens)
Go to Gene View: CASP3
Go to UniProtKB:  P42574
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ACETYL-ASP-GLU-VAL-ASP-CHLOROMETHYL KETONE inhibitor
B
6N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000238
Query on PRD_000238
BAc-Asp-Glu-Val-Asp-CMKPeptide-like / Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.199 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 69.224α = 90.00
b = 84.607β = 90.00
c = 96.171γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
HKL-2000data collection
CNSrefinement
DENZOdata reduction
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-12-12
    Type: Other