3V6M

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.692 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

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:  

  • 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 activ ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-6
A, B, C, D, F, G, I, J
279Homo sapiensMutation(s): 0 
Gene Names: CASP6 (MCH2)
EC: 3.4.22.59
Find proteins for P55212 (Homo sapiens)
Go to Gene View: CASP6
Go to UniProtKB:  P55212
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.692 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.215 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 81.146α = 90.00
b = 162.630β = 95.01
c = 89.150γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
PHENIXphasing
PHENIXmodel building
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-28
    Type: Initial release
  • Version 1.1: 2012-06-13
    Type: Database references, Structure summary