4EHK

Allosteric Modulation of Caspase-3 through Mutagenesis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

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: 10.1042/BSR20120037
  • Primary Citation of Related Structures:  
    4EHH, 4EHK, 4EHL, 4EHN, 4EHA, 4EHD, 4EHF

  • 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase-3 AC277Homo sapiensMutation(s): 2 
Gene Names: CASP3CPP32
EC: 3.4.22.56
Find proteins for P42574 (Homo sapiens)
Explore P42574 
Go to UniProtKB:  P42574
NIH Common Fund Data Resources
PHAROS:  P42574
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ACE-ASP-GLU-VAL-ASP-CHLOROMETHYLKETONE INHIBITOR BD6synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000238
Query on PRD_000238
B, DAc-Asp-Glu-Val-Asp-CMKPeptide-like /  Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.82α = 90
b = 96.775β = 127.39
c = 69.176γ = 90
Software Package:
Software NamePurpose
MAR345data collection
SERGUIdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



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, Source and taxonomy