Allosteric Modulation of Caspase-3 through Mutagenesis

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Allosteric modulation of caspase 3 through mutagenesis.

Walters, J.Schipper, J.L.Swartz, P.Mattos, C.Clark, A.C.

(2012) Biosci Rep 32: 401-411

  • DOI: https://doi.org/10.1042/BSR20120037
  • Primary Citation of Related Structures:  
    4EHA, 4EHD, 4EHF, 4EHH, 4EHK, 4EHL, 4EHN

  • PubMed Abstract: 

    A mutation in the allosteric site of the caspase 3 dimer interface of Val266 to histidine abolishes activity of the enzyme, and models predict that the mutation mimics the action of small molecule allosteric inhibitors by preventing formation of the active site. Mutations were coupled to His266 at two sites in the interface, E124A and Y197C. We present results from X-ray crystallography, enzymatic activity and molecular dynamics simulations for seven proteins, consisting of single, double and triple mutants. The results demonstrate that considering allosteric inhibition of caspase 3 as a shift between discrete 'off-state' or 'on-state' conformations is insufficient. Although His266 is accommodated in the interface, the structural defects are propagated to the active site through a helix on the protein surface. A more comprehensive view of allosteric regulation of caspase 3 requires the representation of an ensemble of inactive states and shows that subtle structural changes lead to the population of the inactive ensemble.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, C
277Homo sapiensMutation(s): 1 
Gene Names: CASP3CPP32
UniProt & NIH Common Fund Data Resources
Find proteins for P42574 (Homo sapiens)
Explore P42574 
Go to UniProtKB:  P42574
PHAROS:  P42574
GTEx:  ENSG00000164305 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42574
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
D [auth B]
6N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.908α = 90
b = 96.768β = 127.19
c = 69.783γ = 90
Software Package:
Software NamePurpose
MAR345data collection
SERGUIdata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-06
    Type: Initial release
  • Version 1.1: 2012-07-18
    Changes: Database references
  • Version 1.2: 2012-12-12
    Changes: Other
  • Version 1.3: 2017-11-15
    Changes: Refinement description