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首页> 外文期刊>BMC Molecular Biology >Nop17 is a key R2TP factor for the assembly and maturation of box C/D snoRNP complex
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Nop17 is a key R2TP factor for the assembly and maturation of box C/D snoRNP complex

机译:Nop17是盒C / D snoRNP复合物组装和成熟的关键R2TP因子

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摘要

Box C/D snoRNPs are responsible for rRNA methylation and processing, and are formed by snoRNAs and four conserved proteins, Nop1, Nop56, Nop58 and Snu13. The snoRNP assembly is a stepwise process, involving other protein complexes, among which the R2TP and Hsp90 chaperone. Nop17, also known as Pih1, has been shown to be a constituent of the R2TP (Rvb1, Rvb2, Tah1, Pih1) and to participate in box C/D snoRNP assembly by its interaction with Nop58. The molecular function of Nop17, however, has not yet been described. To shed light on the role played by Nop17 in the maturation of snoRNP, here we analyzed the interactions domains of Nop58 – Nop17 – Tah1 and the importance of ATP to the interaction between Nop17 and the ATPase Rvb1/2. Based on the results shown here, we propose a model for the assembly of box C/D snoRNP, according to which R2TP complex is important for reducing the affinity of Nop58 for snoRNA, and for the binding of the other snoRNP subunits.
机译:C / D盒snoRNP负责rRNA的甲基化和加工,由snoRNA和四个保守蛋白Nop1,Nop56,Nop58和Snu13组成。 snoRNP组装是一个逐步过程,涉及其他蛋白质复合物,其中包括R2TP和Hsp90分子伴侣。 Nop17,也称为Pih1,已被证明是R2TP的组成部分(Rvb1,Rvb2,Tah1,Pih1),并通过与Nop58的相互作用参与盒C / D snoRNP组装。但是,尚未描述Nop17的分子功能。为了阐明Nop17在snoRNP成熟中的作用,在这里我们分析了Nop58 – Nop17 – Tah1的相互作用域,以及ATP对Nop17和ATPase Rvb1 / 2之间相互作用的重要性。基于此处显示的结果,我们提出了用于框C / D snoRNP组装的模型,根据该模型,R2TP复合物对于降低Nop58对snoRNA的亲和力以及对其他snoRNP亚基的结合很重要。

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