title: Inhibition of interleukin 1 beta-converting enzyme-mediated apoptosis of mammalian cells by baculovirus IAP.
abstract: Apoptosis can be a potent weapon against viral infection and consequently has selected for viruses carrying antiapoptosis genes. Two baculovirus proteins, IAP and p35, can prevent insect cells from dying in response to infection. p35, which interferes with members of the Ced-3 family of cysteine proteases, can also function in mammalian cells. We investigated the ability of IAP from Orgyia pseudotsugata nuclear polyhedrosis virus to prevent death of mammalian cells. IAP was transiently expressed in mammalian cells and its ability to block cell death caused by expression of interleukin-1 beta converting enzyme (ICE), FADD, or the ICE homologues ICH-1 and ICE-Lap3, was investigated. IAP strongly inhibited ICE- and ICH-1-induced cell death but protected only partially against death by overexpression of FADD and not at all against death due to enforced ICE-Lap3 expression. These results demonstrate that a baculoviral IAP protein can functionally interact with conserved components of the apoptosis machinery in mammalian cells.
authors.affiliation: Walter and Eliza Hall Institute of Medical Research, Post Office Royal Melbourne Hospital, Victoria, Australia. HAWKINS@WEHI.EDU.AU
authors.forename: C J
authors.initials: CJ
authors.lastname: Hawkins
authors.forename: A G
authors.initials: AG
authors.lastname: Uren
authors.forename: G
authors.initials: G
authors.lastname: Häcker
authors.forename: R L
authors.initials: RL
authors.lastname: Medcalf
authors.forename: D L
authors.initials: DL
authors.lastname: Vaux
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D029681:Arabidopsis Proteins; D016466:CHO Cells; D020170:Caspase 1; D016923:Cell Death; D006224:Cricetinae; D003546:Cysteine Endopeptidases / Q000096:biosynthesis / Q000378:metabolism*; D044943:Fatty Acid Desaturases / Q000096:biosynthesis*; D015870:Gene Expression; D006367:HeLa Cells; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins; D017924:Nucleopolyhedroviruses / Q000502:physiology*; D010940:Plant Proteins / Q000096:biosynthesis*; D011994:Recombinant Proteins / Q000378:metabolism; D014162:Transfection; D014764:Viral Proteins / Q000494:pharmacology*; D001616:beta-Galactosidase / Q000096:biosynthesis
chemical_list: D029681:Arabidopsis Proteins; D051034:Inhibitor of Apoptosis Proteins; D010940:Plant Proteins; D011994:Recombinant Proteins; D014764:Viral Proteins; C086430:inhibitor of apoptosis, Nucleopolyhedrovirus; D044943:Fatty Acid Desaturases; C084083:Fad7 protein, Arabidopsis; D001616:beta-Galactosidase; D003546:Cysteine Endopeptidases; D020170:Caspase 1