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Interactions between subunits of Saccharomyces cerevisiae RNase MRP support a conserved eukaryotic RNase P/MRP architecture

机译:酿酒酵母RNase MRP亚基之间的相互作用支持保守的真核RNase P / MRP结构

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摘要

Ribonuclease MRP is an endonuclease, related to RNase P, which functions in eukaryotic pre-rRNA processing. In Saccharomyces cerevisiae, RNase MRP comprises an RNA subunit and ten proteins. To improve our understanding of subunit roles and enzyme architecture, we have examined protein-protein and protein–RNA interactions in vitro, complementing existing yeast two-hybrid data. In total, 31 direct protein–protein interactions were identified, each protein interacting with at least three others. Furthermore, seven proteins self-interact, four strongly, pointing to subunit multiplicity in the holoenzyme. Six protein subunits interact directly with MRP RNA and four with pre-rRNA. A comparative analysis with existing data for the yeast and human RNase P/MRP systems enables confident identification of Pop1p, Pop4p and Rpp1p as subunits that lie at the enzyme core, with probable addition of Pop5p and Pop3p. Rmp1p is confirmed as an integral subunit, presumably associating preferentially with RNase MRP, rather than RNase P, via interactions with Snm1p and MRP RNA. Snm1p and Rmp1p may act together to assist enzyme specificity, though roles in substrate binding are also indicated for Pop4p and Pop6p. The results provide further evidence of a conserved eukaryotic RNase P/MRP architecture and provide a strong basis for studies of enzyme assembly and subunit function.
机译:核糖核酸酶MRP是一种与RNase P相关的核酸内切酶,在真核前rRNA加工中起作用。在酿酒酵母中,RNase MRP包含一个RNA亚基和十种蛋白质。为了增进我们对亚基作用和酶结构的了解,我们在体外检查了蛋白质-蛋白质和蛋白质-RNA相互作用,以补充现有的酵母双杂交数据。总共鉴定出31种直接的蛋白质-蛋白质相互作用,每种蛋白质至少与另外三个相互作用。此外,有七个蛋白质自相互作用,其中四个强烈相互作用,表明全酶中的亚基多样性。六个蛋白亚基直接与MRP RNA相互作用,四个与pre-rRNA相互作用。通过对酵母和人RNase P / MRP系统的现有数据进行比较分析,可以可靠地鉴定Pop1p,Pop4p和Rpp1p作为位于酶核心的亚基,并可能添加Pop5p和Pop3p。 Rmp1p被确认为不可或缺的亚基,大概是通过与Snm1p和MRP RNA的相互作用优先与RNase MRP而不是RNase P关联的。 Snm1p和Rmp1p可能一起发挥作用,以协助酶的特异性,尽管在Pop4p和Pop6p的底物结合中也有作用。结果提供了保守的真核RNase P / MRP结构的进一步证据,并为酶组装和亚基功能的研究提供了坚实的基础。

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