3OD5 image
Entry Detail
PDB ID:
3OD5
Title:
Crystal structure of active caspase-6 bound with Ac-VEID-CHO
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2010-08-11
Release Date:
2010-10-27
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.18
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Caspase-6
Chain IDs:A, C (auth: B)
Chain Length:278
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:peptide aldehyde inhibitor AC-VEID-CHO
Chain IDs:B (auth: C), D
Chain Length:5
Number of Molecules:2
Biological Source:
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASA B ASP ASPARTIC ALDEHYDE
Ligand Molecules
Peptide-like Molecules
PRD_000976
Primary Citation
Crystal structures of human caspase 6 reveal a new mechanism for intramolecular cleavage self-activation
Embo Rep. 11 841 847 (2010)
PMID: 20890311 DOI: 10.1038/embor.2010.141

Abstact

Dimeric effectors caspase 3 and caspase 7 are activated by initiator caspase processing. In this study, we report the crystal structures of effector caspase 6 (CASP6) zymogen and N-Acetyl-Val-Glu-Ile-Asp-al-inhibited CASP6. Both of these forms of CASP6 have a dimeric structure, and in CASP6 zymogen the intersubunit cleavage site (190)TEVD(193) is well structured and inserts into the active site. This positions residue Asp 193 to be easily attacked by the catalytic residue Cys 163. We demonstrate biochemically that intramolecular cleavage at Asp 193 is a prerequisite for CASP6 self-activation and that this activation mechanism is dependent on the length of the L2 loop. Our results indicate that CASP6 can be activated and regulated through intramolecular self-cleavage.

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