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  • Title: Regulation of apoptosis by a Caenorhabditis elegans BNIP3 homolog.
    Author: Yasuda M, D'Sa-Eipper C, Gong XL, Chinnadurai G.
    Journal: Oncogene; 1998 Nov 12; 17(19):2525-30. PubMed ID: 9824163.
    Abstract:
    We have identified a C. elegans protein, ceBNIP3, homologous to the human BCL-2/EIB-19K interacting BCL-2 family pro-apoptotic protein BNIP3. In transiently transfected mammalian cells, ceBNIP3 complexes with CED-9, the worm homolog of BCL-2. CeBNIP3 also efficiently heterodimerizes with the cell death protease proCED-3 by direct binding via the prodomain. Transfection of ceBNIP3 and CED-3 results in enhanced proteolytic processing of the CED-3 zymogen and in cooperative induction of apoptosis. Coexpression of CED-9 suppresses the cooperative cell death induced by ceBNIP3 and CED-3. In cells coexpressing CED-9, ceBNIP3 and CED-3, all three proteins exist as a ternary complex suggesting that CED-9 may suppress cooperative apoptosis induced by CED-3 and ceBNIP3 by simultaneous complex formation with CED-3 and ceBNIP3. Our results suggest that ceBNIP3 may be a novel component of the C. elegans apoptosis paradigm and may initiate apoptosis by recruiting CED-3 to mitochondria and other cytoplasmic membranes.
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