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Porins as helpers in mitochondrial protein translocation

机译:Porins作为线粒体蛋白易位的助手

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Mitochondria import the vast majority of their proteins via dedicated protein machineries. The translocase of the outer membrane (TOM complex) forms the main entry site for precursor proteins that are produced on cytosolic ribosomes. Subsequently, different protein sorting machineries transfer the incoming preproteins to the mitochondrial outer and inner membranes, the intermembrane space, and the matrix. In this review, we highlight the recently discovered role of porin, also termed voltage-dependent anion channel (VDAC), in mitochondrial protein biogenesis. Porin forms the major channel for metabolites and ions in the outer membrane of mitochondria. Two different functions of porin in protein translocation have been reported. First, it controls the formation of the TOM complex by modulating the integration of the central receptor Tom22 into the mature translocase. Second, porin promotes the transport of carrier proteins toward the carrier translocase (TIM22 complex), which inserts these preproteins into the inner membrane. Therefore, porin acts as a coupling factor to spatially coordinate outer and inner membrane transport steps. Thus, porin links metabolite transport to protein import, which are both essential for mitochondrial function and biogenesis.
机译:线粒体通过专用的蛋白质机械导入绝大多数蛋白质。外膜(汤姆复合物)的易位酶形成在细胞溶质核糖体上产生的前体蛋白的主要进入部位。随后,不同的蛋白质分选机械将进入的前蛋白质转移到线粒体外部和内膜,膜间空间和基质中。在该综述中,我们突出了在线粒体蛋白生物发生中的幽门,也被称为电压依赖性阴离子通道(Vdac)的最近发现的作用。 Porin形成线粒体外膜中代谢物和离子的主要通道。据报道了豆仁植入蛋白易位的两种不同功能。首先,它通过调节中央受体TOM22进入成熟译团酶的整合来控制汤姆复合物的形成。其次,猪培养促进载体蛋白朝向载体转银酶(TIM22复合物)的转运,其将这些预蛋白质插入内膜中。因此,Porin用作空间坐标外膜输送步骤的耦合因子。因此,Porin将代谢物运输链接到蛋白质进口,这对于线粒体功能和生物发生至关重要。

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