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首页> 外文期刊>Molecular cell >Regulation of protein topology by trans-acting factors at the endoplasmic reticulum.
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Regulation of protein topology by trans-acting factors at the endoplasmic reticulum.

机译:内质网中反式作用因子对蛋白质拓扑结构的调控。

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摘要

In mammalian cells, the Sec61 complex and translocating chain-associated membrane protein (TRAM) are necessary and sufficient to direct the biogenesis, in the appropriate topology, of all secretory and membrane proteins examined thus far. We demonstrate here that the proper translocation of the prion protein (PrP), a substrate that can be synthesized in more than one topologic form, requires additional factors. In the absence of these additional factors, PrP is synthesized exclusively in the transmembrane topology (termed the CtmPrP form) associated with the development of neurodegenerative disease. Thus, translocation accessory factors, acting on some but not other substrates, can function as molecular switches to redirect nascent proteins toward divergent topologic fates with different functional consequences.
机译:在哺乳动物细胞中,Sec61复合物和易位链相关的膜蛋白(TRAM)是必要的,并且足以指导迄今检查的所有分泌蛋白和膜蛋白在适当的拓扑结构下进行生物发生。我们在这里证明that病毒蛋白(PrP),可以以一种以上的拓扑形式合成的底物的适当易位,需要其他因素。在没有这些其他因素的情况下,PrP仅在与神经退行性疾病发展相关的跨膜拓扑结构(称为CtmPrP形式)中合成。因此,易位辅助因子,在某些而非其他底物上起作用,可以充当分子开关,将新生的蛋白质重定向到具有不同功能后果的不同拓扑命运。

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