Journal article

Cytochrome c activation of CPP32-like proteolysis plays a critical role in a Xenopus cell-free apoptosis system

RM Kluck, SJ Martin, BM Hoffman, JS Zhou, DR Green, DD Newmeyer

The EMBO Journal | WILEY | Published : 1997


In a cell-free system based on Xenopus egg extracts, Bcl-2 blocks apoptotic activity by preventing cytochrome c release from mitochondria. We now describe in detail the crucial role of cytochrome c in this system. The mitochondrial fraction, when incubated with cytosol, releases cytochrome c. Cytochrome c in turn induces the activation of protease(s) resembling caspase-3 (CPP32), leading to downstream apoptotic events, including the cleavage of fodrin and lamin B1. CPP32-like protease activity plays an essential role in this system, as the caspase inhibitor, Ac-DEVD-CHO, strongly inhibited fodrin and lamin B1 cleavage, as well as nuclear morphology changes. Cytochrome c preparations from var..

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University of Melbourne Researchers