The exosome contains domains with specific endoribonuclease, exoribonuclease and cytoplasmic mRNA decay activities.

The exosome contains domains with specific endoribonuclease, exoribonuclease and cytoplasmic mRNA decay activities.
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DOI:
10.1038/nsmb.1528
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发表时间:
2009-01
影响因子:
16.8
通讯作者:
van Hoof, Ambro
van Hoof, Ambro
中科院分区:
生物学1区
文献类型:
--
作者:
Schaeffer, Daneen;Tsanova, Borislava;Barbas, Ana;Reis, Filipa Pereira;Dastidar, Eeshita Ghosh;Sanchez-Rotunno, Maya;Arraiano, Cecilia Maria;van Hoof, Ambro

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真核外切体是一个由10个亚基组成的3‘外切核糖核酸酶复合体,负责许多RNA的加工和降解反应。外显体是如何做到这一点的还不得而知。我们发现Rrp44的PIN结构域是一种内切核酸酶。PIN结构域的活性更喜欢5‘磷酸的RNA,这表明5’和3‘处理是协调的。我们还表明,内切酶活性在体内是重要的。此外,必需的外切体亚单位Csl4不包含任何必需的结构域,但它的锌带结构域是外切体介导的mRNA衰变所必需的。这些结果表明,特定的外切体结构域对特定的功能有贡献,不同的RNA与外切体相互作用的方式不同。内切核酸酶和外切核糖核酸酶的结合似乎是RNA降解机器的一个普遍特征。
The eukaryotic exosome is a ten subunit 3′ exoribonuclease complex responsible for many RNA processing and degradation reactions. How the exosome accomplishes this is unknown. We show that the PIN domain of Rrp44 is an endoribonuclease. The activity of the PIN domain prefers RNA with a 5′ phosphate, suggesting coordination of 5′ and 3′ processing. We also show that the endonuclease activity is important in vivo. Furthermore, the essential exosome subunit Csl4 does not contain any essential domains, but its zinc-ribbon domain is required for exosome-mediated mRNA decay. These results suggest that specific exosome domains contribute to specific functions, and that different RNAs interact with the exosome differently. The combination of an endoribonuclease and exoribonuclease activity appears to be a widespread feature of RNA degrading machines.
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