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Volume 271, Number 35, Issue of August 30, 1996 pp. 20977-20980
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

COMMUNICATION:
Molecular Ordering of Apoptotic Mammalian CED-3/ICE-like Proteases

(Received for publication, July 2, 1996)

Kim Orth , Karen O'Rourke , Guy S. Salvesen Dagger and Vishva M. Dixit

From the Department of Pathology, University of Michigan, Ann Arbor, Michigan 48109 and the Dagger  Burnham Institute, La Jolla, California 92037

Apoptosis is executed by cysteine proteases belonging to the CED-3/ICE family, which, unlike other mammalian cysteine proteases, cleave their substrates following aspartate residues. Proteases belonging to this family exist in the cytosol as zymogens that require accurate processing at internal aspartate residues to generate the two-chain active enzymes. As such, CED-3/ICE family members are capable of activating each other in a manner analogous to the protease zymogens of the coagulation or complement cascades. At present, it is unknown whether such mutual processing exists in vivo, and if so whether it is sequential, implying an order to the death pathway. Using a cell-free apoptosis system, recombinant ICE proteases and both biochemical and morphological criteria, we demonstrate an ordering of the mammalian ICEs that are most related to the Caenorhabditis elegans death protease CED-3.


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