3od5

Publication Abstract from PubMed

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.

Crystal structures of human caspase 6 reveal a new mechanism for intramolecular cleavage self-activation.,Wang XJ, Cao Q, Liu X, Wang KT, Mi W, Zhang Y, Li LF, Leblanc AC, Su XD EMBO Rep. 2010 Oct 1. PMID:20890311^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.