4HQR

Crystal Structure of mutant form of Caspase-7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report



Literature

Structural asymmetry of procaspase-7 bound to a specific inhibitor

Kang, H.J.Lee, Y.M.Bae, K.H.Kim, S.J.Chung, S.J.

(2013) Acta Crystallogr D Biol Crystallogr 69: 1514-1521

  • DOI: 10.1107/S0907444913010196
  • Primary Citation of Related Structures:  
    4HQ0, 4HQR

  • PubMed Abstract: 
  • Caspase-7 is expressed as a proenzyme and is activated by initiator caspases upon the transmission of cell-death signals. Despite extensive structural and biochemical analyses, many questions regarding the mechanism of caspase-7 activation remain unanswe ...

    Caspase-7 is expressed as a proenzyme and is activated by initiator caspases upon the transmission of cell-death signals. Despite extensive structural and biochemical analyses, many questions regarding the mechanism of caspase-7 activation remain unanswered. Caspase-7 is auto-activated during overexpression in Escherichia coli, even in the absence of initiator caspases, indicating that procaspase-7 has intrinsic catalytic activity. When variants of procaspase-7 with altered L2 loops were prepared, a variant with six inserted amino acids showed meaningful catalytic activity which was inhibited by Ac-DEVD-CHO. The kinetic constants of the procaspase-7 variant were determined and its three-dimensional structure was solved with and without bound inhibitor. The homodimeric procaspase-7 bound to the inhibitor revealed an asymmetry. One monomer formed a complete active site bound to the inhibitor in collaboration with the L2 loop from the other monomer, whereas the other monomer had an incomplete active site despite the bound inhibitor. Consequently, the two L2 loops in homodimeric procaspase-7 served as inherent L2 and L2' loops forming one complete active site. These data represent the first three-dimensional structure of a procaspase-7 variant bound to a specific inhibitor, Ac-DEVD-CHO, and provide insight into the folding mechanism during caspase-7 activation and the basal activity level of procaspase-7.


    Organizational Affiliation

    Department of Chemistry, College of Natural Science, Dongguk University, 26 Pil-dong 3-ga, Jung-gu, Seoul 100-715, Republic of Korea.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase-7 AB272Homo sapiensMutation(s): 1 
Gene Names: CASP7MCH3
EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens)
Explore P55210 
Go to UniProtKB:  P55210
NIH Common Fund Data Resources
PHAROS:  P55210
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ac-Asp-Glu-Val-Asp-Aldehyde EF5N/AMutation(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_000422
Query on PRD_000422
E, FAc-Asp-Glu-Val-Asp-AldehydePeptide-like /  Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.48α = 90
b = 90.48β = 90
c = 185.05γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-11
    Type: Initial release