Inhibition of the Caenorhabditis elegans cell-death protease CED-3 by a CED-3 cleavage site in baculovirus p35 protein
- 1 September 1995
- journal article
- letter
- Published by Springer Nature in Nature
- Vol. 377 (6546) , 248-251
- https://doi.org/10.1038/377248a0
Abstract
THE baculovirus protein p35 inhibits programmed cell death in such diverse animals as insects, nematodes and mammals1-5. Here we show that p35 protein is a substrate for and inhibitor of the Caenorhabditis elegans cell-death protease CED-3 (refs 6, 7) and a substrate for four CED-3-like vertebrate cysteine protease activi-ties implicated in apoptosis in mammals7-14. A p35 mutation that greatly reduced p35 activity in vitro as a CED-3 substrate and inhibitor abolished p35 activity in vivo in protecting against cell death in C. elegans. Introduction of the CED-3 cleavage site in p35 into the cowpox virus protein crmA, which inhibits mammalian apoptosis14-19 but not programmed cell death in C. elegans, caused crmA to block CED-3-mediated cell death. These observations suggest that p35 may prevent programmed cell death in C. elegans and other species by acting as a competitive inhibitor of cysteine proteases.Keywords
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