Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 62.03 kDa 
• Atom Count: 3424 
• Modelled Residue Count: 427 
• Deposited Residue Count: 544 
• Unique protein chains: 1

4HQ0

Crystal Structure of mutant form of Caspase-7

• DOI: 10.2210/pdb4HQ0/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2012-10-25 Released: 2013-09-11 
• Deposition Author(s): Lee, Y., Kang, H.J., Bae, K.-H., Kim, S.J., Chung, S.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.267 
• R-Value Work: 0.222 
• R-Value Observed: 0.224 

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

• PubMed: 23897474 
• 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 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.

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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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Caspase-7	A, B	272	Homo sapiens	Mutation(s): 1  Gene Names: CASP7, MCH3 EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens) Explore P55210  Go to UniProtKB:  P55210
NIH Common Fund Data Resources
PHAROS:  P55210 GTEx:  ENSG00000165806

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.267 
• R-Value Work: 0.222 
• R-Value Observed: 0.224 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.6	α = 90
b = 89.6	β = 90
c = 182.84	γ = 120

Software Package:

Software Name	Purpose
ADSC	data collection
PHASER	phasing
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-10-25 
• Released Date: 2013-09-11 
Deposition Author(s): Lee, Y., Kang, H.J., Bae, K.-H., Kim, S.J., Chung, S.J.

Revision History  

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