Dissecting functional cooperation among protein subunits in archaeal RNase P, a catalytic ribonucleoprotein complex.

Dissecting functional cooperation among protein subunits in archaeal RNase P, a catalytic ribonucleoprotein complex.
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在古细胞RNase P中解剖蛋白质亚基(一种催化核糖核蛋白复合物)中的功能合作。

DOI:
10.1093/nar/gkq668
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发表时间:
2010-12
影响因子:
14.9
通讯作者:
Gopalan V
Gopalan V
中科院分区:
生物学2区
文献类型:
--
作者:
Chen WY;Pulukkunat DK;Cho IM;Tsai HY;Gopalan V

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RNase P催化前体tRNA的Mg 2+依赖性5′-成熟。细菌全酶由一种催化性RNase P RNA(RPR)和一种RNase P蛋白(RPP)组成,对它的生化研究有助于理解蛋白质促进RNA催化的多效性作用(包括底物/Mg 2+结合)。作为一个模型,揭示了多个蛋白质之间的功能协调,帮助RNA催化剂,我们使用古细菌RNase P,其中包括一个催化RPR和至少四个RPPs。利用我们以前的发现,这些古细菌的RPP功能作为两个二元RPP复合物(POP 5·RPP 30和RPP 21·RPP 29),我们制备了重组RPP对从三个古细菌和建立通过同源/异源组装的亚基的可重复性。我们发现古细菌POP 5·RPP 30与细菌和细胞器RPR重组,表明这种二元复合物与细菌RPP的功能重叠,并强调了它们对遗传上保守的RPR催化核心的共同识别,我们通过缺失诱变进一步定义了其最小属性。此外,单周转动力学研究表明,虽然POP 5·RPP 30仅负责提高RPR的前体tRNA切割速率(60倍),但RPP 21·RPP 29有助于提高底物亲和力(16倍)。总的来说,这些研究为古老的催化核糖核蛋白的功能和进化提供了新的视角。
RNase P catalyzes the Mg2+-dependent 5′-maturation of precursor tRNAs. Biochemical studies on the bacterial holoenzyme, composed of one catalytic RNase P RNA (RPR) and one RNase P protein (RPP), have helped understand the pleiotropic roles (including substrate/Mg2+ binding) by which a protein could facilitate RNA catalysis. As a model for uncovering the functional coordination among multiple proteins that aid an RNA catalyst, we use archaeal RNase P, which comprises one catalytic RPR and at least four RPPs. Exploiting our previous finding that these archaeal RPPs function as two binary RPP complexes (POP5•RPP30 and RPP21•RPP29), we prepared recombinant RPP pairs from three archaea and established interchangeability of subunits through homologous/heterologous assemblies. Our finding that archaeal POP5•RPP30 reconstituted with bacterial and organellar RPRs suggests functional overlap of this binary complex with the bacterial RPP and highlights their shared recognition of a phylogenetically-conserved RPR catalytic core, whose minimal attributes we further defined through deletion mutagenesis. Moreover, single-turnover kinetic studies revealed that while POP5•RPP30 is solely responsible for enhancing the RPR’s rate of precursor tRNA cleavage (by 60-fold), RPP21•RPP29 contributes to increased substrate affinity (by 16-fold). Collectively, these studies provide new perspectives on the functioning and evolution of an ancient, catalytic ribonucleoprotein.
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