Afifi R, Sharf R, Shtrichman R, Kleinberger T
Gonda Center of Molecular Microbiology, Bruce Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel.
J Virol. 2001 May;75(9):4444-7. doi: 10.1128/JVI.75.9.4444-4447.2001.
Adenovirus E4orf4 protein has been shown to induce p53-independent, protein phosphatase 2A (PP2A)-dependent apoptosis in transformed cells. Furthermore, E4orf4 also induces toxicity in Saccharomyces cerevisiae in a PP2A-dependent manner (D. Kornitzer and T. Kleinberger, submitted for publication). In this work, we utilized yeast cells to select for nonapoptotic E4orf4 mutants which, in turn, were shown to possess a diminished ability to bind PP2A. The success of this selection system will provide additional apoptosis-relevant mutants for E4orf4 research and strongly supports the relevance of E4orf4-induced toxicity in S. cerevisiae to E4orf4-induced apoptosis in mammalian cells.
腺病毒E4orf4蛋白已被证明可在转化细胞中诱导不依赖p53、依赖蛋白磷酸酶2A(PP2A)的细胞凋亡。此外,E4orf4还以PP2A依赖的方式在酿酒酵母中诱导毒性(D. Kornitzer和T. Kleinberger,待发表)。在这项工作中,我们利用酵母细胞筛选非凋亡性E4orf4突变体,结果表明这些突变体与PP2A结合的能力减弱。该筛选系统的成功将为E4orf4研究提供更多与细胞凋亡相关的突变体,并有力支持E4orf4在酿酒酵母中诱导的毒性与在哺乳动物细胞中诱导的细胞凋亡之间的相关性。