Crystal Structure of caspase-6 inactivation mutation

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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Inhibitory mechanism of caspase-6 phosphorylation revealed by crystal structures, molecular dynamics simulations, and biochemical assays

Cao, Q.Wang, X.J.Liu, C.W.Liu, D.F.Li, L.F.Gao, Y.Q.Su, X.D.

(2012) J Biol Chem 287: 15371-15379

  • DOI: https://doi.org/10.1074/jbc.M112.351213
  • Primary Citation of Related Structures:  
    3V6L, 3V6M

  • PubMed Abstract: 

    The apoptotic effector caspase-6 (CASP6) has been clearly identified as a drug target due to its strong association with neurodegeneration and axonal pruning events as well as its crucial roles in Huntington disease and Alzheimer disease. CASP6 activity is suppressed by ARK5-mediated phosphorylation at Ser(257) with an unclear mechanism. In this work, we solved crystal structures of ΔproCASP6S257E and p20/p10S257E, which mimicked the phosphorylated CASP6 zymogen and activated CASP6, respectively. The structural investigation combined with extensive biochemical assay and molecular dynamics simulation studies revealed that phosphorylation on Ser(257) inhibited self-activation of CASP6 zymogen by "locking" the enzyme in the TEVD(193)-bound "inhibited state." The structural and biochemical results also showed that phosphorylation on Ser(257) inhibited the CASP6 activity by steric hindrance. These results disclosed the inhibition mechanism of CASP6 phosphorylation and laid the foundation for a new strategy of rational CASP6 drug design.

  • Organizational Affiliation

    State Key Laboratory of Protein and Plant Gene Research and Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
282Homo sapiensMutation(s): 0 
Gene Names: CASP6
UniProt & NIH Common Fund Data Resources
Find proteins for P55212 (Homo sapiens)
Explore P55212 
Go to UniProtKB:  P55212
PHAROS:  P55212
GTEx:  ENSG00000138794 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP55212
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.35α = 90
b = 126.35β = 90
c = 165.82γ = 120
Software Package:
Software NamePurpose
XDSdata scaling
PHENIXmodel building
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-28
    Type: Initial release
  • Version 1.1: 2012-06-13
    Changes: Database references, Structure summary
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Refinement description