title: Bik, a novel death-inducing protein shares a distinct sequence motif with Bcl-2 family proteins and interacts with viral and cellular survival-promoting proteins.
abstract: The survival-promoting activity of the Bcl-2 family of proteins appears to be modulated by interactions between various cellular proteins. We have identified a novel cellular protein, Bik, that interacts with the cellular survival-promoting proteins, Bcl-2 and Bcl-xL, as well as the viral survival-promoting proteins, Epstein Barr virus-BHRF1 and adenovirus E1B-19 kDa. In transient transfection assays, Bik promotes cell death in a manner similar to the death-promoting members of the Bcl-2 family, Bax and Bak. This death-promoting activity of Bik can be suppressed by coexpression of Bcl-2, Bcl-XL, EBV-BHRF1 and E1B-19 kDa proteins suggesting that Bik may be a common target for both cellular and viral anti-apoptotic proteins. While Bik does not show overt homology to the BH1 and BH2 conserved domains characteristic of the Bcl-2 family, it does share a 9 amino acid domain (BH3) with Bax and Bak which may be a critical determinant for the death-promoting activity of these proteins.
mesh_terms: D000256:Adenoviridae / Q000378:metabolism; D017501:Adenovirus E1B Proteins / Q000737:chemistry / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D051017:Apoptosis Regulatory Proteins; D001402:B-Lymphocytes / Q000378:metabolism; D001483:Base Sequence; D016923:Cell Death; D002460:Cell Line; D005347:Fibroblasts; D015723:Gene Library; D004854:Herpesvirus 4, Human / Q000378:metabolism; D006801:Humans; D008565:Membrane Proteins; D024101:Mitochondrial Proteins; D008969:Molecular Sequence Data; D011493:Protein Kinase C / Q000378:metabolism; D011506:Proteins / Q000737:chemistry* / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000737:chemistry* / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2; D051381:Rats; D011994:Recombinant Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D014162:Transfection; D014764:Viral Proteins / Q000737:chemistry* / Q000378:metabolism; D051020:bcl-X Protein
chemical_list: D017501:Adenovirus E1B Proteins; D051017:Apoptosis Regulatory Proteins; C494811:BCL2L1 protein, human; C083278:BHRF1 protein, Human herpesvirus 4; C096820:BIK protein, human; C494813:Bcl2l1 protein, rat; D008565:Membrane Proteins; D024101:Mitochondrial Proteins; D011506:Proteins; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D011994:Recombinant Proteins; D014764:Viral Proteins; D051020:bcl-X Protein; D011493:Protein Kinase C