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  • Title: The CED-3/ICE-like protease Mch2 is activated during apoptosis and cleaves the death substrate lamin A.
    Author: Orth K, Chinnaiyan AM, Garg M, Froelich CJ, Dixit VM.
    Journal: J Biol Chem; 1996 Jul 12; 271(28):16443-6. PubMed ID: 8663580.
    Abstract:
    Phylogenetic analysis of the CED-3/ICE family of cysteine proteases suggests the existence of a subfamily most related to the Caenorhabditis elegans death gene ced-3 and includes Yama (CPP32, apopain), LAP3 (Mch3, CMH1), and Mch2. Here, we show that Mch2 is processed from its zymogen form to a proteolytically active dimeric species during execution of the apoptotic program and by the cytotoxic T cell death protease granzyme B. Additionally, like Yama and LAP3, Mch2 functions downstream of the death inhibitors Bcl-2, Bcl-xL, and CrmA. Importantly, Mch2, but not Yama or LAP3, is capable of cleaving lamin A to its signature apoptotic fragment, indicating that Mch2 is an apoptotic laminase.
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