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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The BNIP-2 and Cdc42GAP homology/Sec14p-like domain of BNIP-Salpha is a novel apoptosis-inducing sequence.

We have cloned the cDNAs for two novel human proteins, designated BNIP-Salpha and beta (for BNIP-2 Similar) that are homologous to BNIP-2, a previously known Bcl-2 and E1B-associated protein. The BNIP-S gene encodes two protein isoforms; the longer protein (BNIP-Salpha) contains a complete BNIP-2 and Cdc42GAP Homology ( BCH) domain, a novel protein domain that we recently identified, whereas its shorter variant (BNIP-Sbeta) lacks the full BCH domain as a result of an alternative RNA splicing that introduces a nonsense intron. Primer-specific reverse-transcription PCR revealed that both BNIP-Salpha and BNIP-Sbeta mRNA are differentially expressed in various cells and tissues. The expression of BNIP-Salpha or the complete BCH domain, but not BNIP-Sbeta, causes extensive apoptosis in cells. Furthermore, BNIP-Salpha can form a homophilic complex via a unique sequence motif within its BCH domain, and deletion of this interacting motif prevents its pro-apoptotic effect. These results indicate the presence of two BNIP-S splicing variants as cellular regulators and that the BCH domain of BNIP-Salpha confers a novel apoptotic function. The significance of this is discussed.[1]


  1. The BNIP-2 and Cdc42GAP homology/Sec14p-like domain of BNIP-Salpha is a novel apoptosis-inducing sequence. Zhou, Y.T., Soh, U.J., Shang, X., Guy, G.R., Low, B.C. J. Biol. Chem. (2002) [Pubmed]
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