BH3-only protein Bmf mediates apoptosis upon inhibition of CAP-dependent protein synthesis.

BH3-only protein Bmf mediates apoptosis upon inhibition of CAP-dependent protein synthesis.
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DOI:
10.1038/cdd.2010.97
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发表时间:
2010-11
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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严格的转录调控、翻译后修饰和/或仅BH3蛋白的选择性剪接可微调其促凋亡功能。在这里,我们描述了仅BH3蛋白BMF(Bcl-2修改因子)的基因位点,并描述了从一个共同的转录本产生两个主要异构体的过程,其中蛋白质合成的起始涉及编码亮氨酸的CUG。BmfCUG和最初描述的Bmf Short(BmfS)与促进生存的Bcl2家族成员显示出类似的结合亲和力,优先定位于线粒体膜外膜,并诱导快速的Bcl2可阻断的细胞凋亡。值得注意的是,内源性BMF的表达是在已知的导致抑制依赖CAP的翻译机制的细胞应激形式时诱导的,如血清剥夺、低氧、抑制PI3K/AKT途径或mTOR,以及对真核细胞翻译起始因子eIF-4E的直接药物抑制。在某些情况下,BMF的敲除或缺失可以减少细胞凋亡,这表明BMF可以作为压力受损的CAP依赖的蛋白质翻译机制的哨兵(150)。
Tight transcriptional regulation, post-translational modifications and/or alternative splicing of BH3-only proteins fine-tune their pro-apoptotic function. Here, we characterize the gene locus of the BH3-only protein Bmf (Bcl-2 modifying factor) and describe the generation of two major isoforms from a common transcript where initiation of protein synthesis involves leucine-coding CUG. BmfCUG and the originally described isoform, Bmf short (BmfS), display comparable binding affinities to pro-survival Bcl-2 family members, localize preferentially to the outer mitochondrial membrane and induce rapid Bcl-2-blockable apoptosis. Notably, endogenous Bmf expression is induced upon forms of cell stress known to cause the repression of the CAP-dependent translation machinery such as serum-deprivation, hypoxia, inhibition of the PI3K/AKT pathway or mTOR, as well as direct pharmacological inhibition of eukaryotic translation initiation factor eIF-4E. Knock-down or deletion of Bmf reduces apoptosis under some of these conditions demonstrating that Bmf can act as a sentinel for the stress-impaired CAP-dependent protein translation machinery (150).
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