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AN RNA-EXPORT MEDIATOR WITH AN ESSENTIAL NUCLEAR EXPORT SIGNAL

机译:具有基本核出口信号的RNA出口介体

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THE Rev protein of human immunodeficiency virus type 1 (HIV-1) mediates the translocation of viral messenger RNAs from the nucleus to the cytoplasm. In yeast, Rev can mediate the nuclear export of Rev response element containing RNAs(1). The export of Rev itself proceeds through the nuclear pore complex and requires a nuclear export signal (NES)(2,3) and interaction with a cellular cofactor, the protein Rip1 (refs 1, 4, 5). Endogenous RNA export mediators that interact with Rip1 and harbour NESs are thought to exist(6,7) but have yet to be identified, Here we report the characterization of a new and essential yeast protein, Gle1, which contains an NES and has a relative molecular mass of 62,000. Mutation of the NES in Gle1 prevents export of polyadenylated RNA from the nucleus. Gle1 interacts with Rip1 and the nucleo-porin Nup100 and is localized predominantly at nuclear pore complexes. These properties indicate that Gle1 is an RNA-export factor and that Rev may mediate viral RNA export by mimicking the function of Gle1. [References: 29]
机译:人类1型免疫缺陷病毒(HIV-1)的Rev蛋白介导病毒信使RNA从细胞核到细胞质的转运。在酵母中,Rev可以介导含有RNA的Rev响应元件的核输出(1)。 Rev自身的输出通过核孔复合体进行,需要核输出信号(NES)(2,3)并与细胞辅助因子Rip1蛋白相互作用(参考文献1、4、5)。与Rip1和港口NESs相互作用的内源性RNA出口介体被认为是存在的(6,7),但尚未被鉴定,在这里我们报告了一种新的和必不可少的酵母蛋白Gle1的表征,该蛋白含有NES并具有相对分子量为62,000。 Gle1中的NES突变可阻止多腺苷酸RNA从细胞核中输出。 Gle1与Rip1和核孔蛋白Nup100相互作用,并主要位于核孔复合体。这些性质表明,Gle1是一种RNA出口因子,Rev可以通过模仿Gle1的功能来介导病毒RNA的出口。 [参考:29]

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