A conformational switch in PRP8 mediates metal ion coordination that promotes pre-mRNA exon ligation.

A conformational switch in PRP8 mediates metal ion coordination that promotes pre-mRNA exon ligation.
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PRP8中的构象开关介导了促进前MRNA外显子连接的金属离子配位。

DOI:
10.1038/nsmb.2556
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发表时间:
2013-06
影响因子:
16.8
通讯作者:
MacMillan, Andrew M.
MacMillan, Andrew M.
中科院分区:
生物学1区
文献类型:
--
作者:
Schellenberg, Matthew J.;Wu, Tao;Ritchie, Dustin B.;Fica, Sebastian;Staley, Jonathan P.;Atta, Karim A.;LaPointe, Paul;MacMillan, Andrew M.

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真核生物中前mRNA的剪接是由剪接体催化的,剪接体是一种大型的RNA-蛋白质金属酶。剪接体的催化中心涉及由U2和U6 snRNA组成的结构,并包括由U6 snRNA结合的金属。然而,剪接体活性位点的精确结构,包括它是否包含蛋白质成分的问题,仍然没有得到解决。大量的证据表明,蛋白质PRP 8通过组装和催化作用位于剪接体的中心。在这里,我们提供的证据表明,核糖核酸酶H结构域的PRP 8经历了两个步骤之间的构象转换剪接合理化酵母prp 8等位基因促进第一或第二步。我们还表明,这个开关揭露了第二步中涉及的金属结合位点。这些数据一起确定PRP 8是促进剪接体内外显子连接的金属蛋白。
Splicing of pre-mRNAs in eukaryotes is catalyzed by the spliceosome a large RNA–protein metalloenzyme. The catalytic center of the spliceosome involves a structure comprised of the U2 and U6 snRNAs and includes a metal bound by U6 snRNA. The precise architecture of the splicesome active site however, including the question of whether it includes protein components, remains unresolved. A wealth of evidence places the protein PRP8 at the heart of the spliceosome through assembly and catalysis. Here we provide evidence that the RNase H domain of PRP8 undergoes a conformational switch between the two steps of splicing rationalizing yeast prp8 alleles promoting either the first or second step. We also show that this switch unmasks a metal-binding site involved in the second step. Together these data establish that PRP8 is a metalloprotein that promotes exon ligation within the spliceosome.
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