An essential role for Clp1 in assembly of polyadenylation complex CF IA and Pol II transcription termination.

An essential role for Clp1 in assembly of polyadenylation complex CF IA and Pol II transcription termination.
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DOI:
10.1093/nar/gkr800
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发表时间:
2012-02
影响因子:
14.9
通讯作者:
Minvielle-Sébastia L
Minvielle-Sébastia L
中科院分区:
生物学2区
文献类型:
--
作者:
Haddad R;Maurice F;Viphakone N;Voisinet-Hakil F;Fribourg S;Minvielle-Sébastia L

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多聚腺苷酸化是真核生物中修饰mRNA 3′端的共转录过程。在酵母中,CF IA和CPF构成核心3′-末端成熟复合物。CF IA包含Rna 14 p、Rna 15 p、Pcf 11 p和Clp 1 p。CF IA通过Pcf 11 p与RNA Pol II最大亚基的C-末端结构域相互作用,Pcf 11 p将前体mRNA 3′-末端加工连接到转录终止。本文分析了Clp 1 p在3′加工中的作用。Clp 1 p结合ATP,在CF IA中仅与Pcf 11 p相互作用。Clp 1 p的缺失废除了转录终止。此外,我们发现ATP结合结构域和远处Pcf 11 p结合区的突变会损害3′端加工。引人注目的是,这些突变不仅阻止Clp 1 p-Pcf 11 p相互作用,而且阻止Pcf 11 p与Rna 14 p-Rna 15 p的结合。ChIP实验表明,Rna 15 p与蛋白质编码基因3′端的交联受到这些突变的干扰,而Pcf 11 p仅受到部分影响。我们的研究揭示了Clp 1 p在CF IA组织中的重要作用。我们推测Clp 1 p通过Pcf 11 p将构象变化传递给RNA Pol II,从而耦合转录终止和3′-末端加工。这些重排可能依赖于Clp 1 p中ATP的正确方向。
Polyadenylation is a co-transcriptional process that modifies mRNA 3′-ends in eukaryotes. In yeast, CF IA and CPF constitute the core 3′-end maturation complex. CF IA comprises Rna14p, Rna15p, Pcf11p and Clp1p. CF IA interacts with the C-terminal domain of RNA Pol II largest subunit via Pcf11p which links pre-mRNA 3′-end processing to transcription termination. Here, we analysed the role of Clp1p in 3′ processing. Clp1p binds ATP and interacts in CF IA with Pcf11p only. Depletion of Clp1p abolishes transcription termination. Moreover, we found that association of mutations in the ATP-binding domain and in the distant Pcf11p-binding region impair 3′-end processing. Strikingly, these mutations prevent not only Clp1p-Pcf11p interaction but also association of Pcf11p with Rna14p-Rna15p. ChIP experiments showed that Rna15p cross-linking to the 3′-end of a protein-coding gene is perturbed by these mutations whereas Pcf11p is only partially affected. Our study reveals an essential role of Clp1p in CF IA organization. We postulate that Clp1p transmits conformational changes to RNA Pol II through Pcf11p to couple transcription termination and 3′-end processing. These rearrangements likely rely on the correct orientation of ATP within Clp1p.
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