3V6M

Inhibition of caspase-6 activity by single mutation outside the active site

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 

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Literature

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: 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 ...

    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.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase-6 A, B, C, D, F, G, I, J279Homo sapiensMutation(s): 0 
Gene Names: CASP6, MCH2
EC: 3.4.22.59
Find proteins for P55212 (Homo sapiens)
Explore P55212 
Go to UniProtKB:  P55212
NIH Common Fund Data Resources
PHAROS:  P55212
GTEx:  ENSG00000138794
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.146α = 90
b = 162.63β = 95.01
c = 89.15γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

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