4IYR

Crystal structure of full-length caspase-6 zymogen


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.697 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The regulatory mechanism of the caspase 6 pro-domain revealed by crystal structure and biochemical assays.

Cao, Q.Wang, X.J.Li, L.F.Su, X.D.

(2014) Acta Crystallogr.,Sect.D 70: 58-67

  • DOI: 10.1107/S1399004713024218

  • PubMed Abstract: 
  • Caspase 6 (CASP6) is a neuron degeneration-related protease and is widely considered to be a potential drug-design target against neurodegenerative diseases such as Huntington's disease and Alzheimer's disease. The N-terminal pro-peptide of CASP6, al ...

    Caspase 6 (CASP6) is a neuron degeneration-related protease and is widely considered to be a potential drug-design target against neurodegenerative diseases such as Huntington's disease and Alzheimer's disease. The N-terminal pro-peptide of CASP6, also referred to as the pro-domain, contains 23 residues and its functional role remains elusive. In this study, the crystal structure of a full-length CASP6 zymogen mutant, proCASP6H121A, was solved. Although the pro-domain was flexible in the crystal, without visible electron density, structural analyses combined with biochemical assays revealed that the pro-domain inhibited CASP6 auto-activation by inhibiting intramolecular cleavage at the intersubunit cleavage site TEVD(193) and also by preventing this site from intermolecular cleavage at low protein concentration through a so-called `suicide-protection' mechanism. Further experiments showed that the length of the pro-domain and the side chain of Asn18 played critical roles in suicide protection. These results disclosed a new inhibitory mechanism of CASP6 and shed light on the pathogenesis and therapeutically relevant study of CASP6-related neurodegenerative diseases.


    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, People's Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-6
A, B
304Homo sapiensMutation(s): 1 
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: 2.697 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.180 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 158.062α = 90.00
b = 158.062β = 90.00
c = 126.940γ = 90.00
Software Package:
Software NamePurpose
PHENIXmodel building
HKL-2000data reduction
HKL-2000data collection
PHENIXrefinement
SCALAdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-15
    Type: Initial release
  • Version 1.1: 2020-01-01
    Type: Database references