The structural basis for the interaction between the CAF1 nuclease and the NOT1 scaffold of the human CCR4-NOT deadenylase complex.

The structural basis for the interaction between the CAF1 nuclease and the NOT1 scaffold of the human CCR4-NOT deadenylase complex.
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DOI:
10.1093/nar/gks883
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发表时间:
2012-11
影响因子:
14.9
通讯作者:
Weichenrieder O
Weichenrieder O
中科院分区:
生物学2区
文献类型:
--
作者:
Petit AP;Wohlbold L;Bawankar P;Huntzinger E;Schmidt S;Izaurralde E;Weichenrieder O

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CCR4-NOT复合物在真核细胞转录后mRNA调控中起着至关重要的作用。它催化mRNA多聚(A)尾部的去除,从而抑制翻译并使mRNA衰变。该复合物的保守核心包括一个催化模块,包含两个死烯化酶(CAF1/POP2和CCR4a/b)和NOT模块,其中至少包含NOT1、NOT2和NOT3。NOT1在两个模块之间架起相互作用的桥梁,因此,作为复合物组装的支架蛋白。在这里,我们展示了人类NOT1单独和与CAF1复合的CAF1结合域的晶体结构。NOT1结构域包括5个采用MIF4G (eIF4G中间部分)褶皱的螺旋发夹。NOT1 MIF4G结构域通过预先形成的界面与CAF1结合,使CAF1的催化位点完全可被RNA底物接触。关键结构残基和界面残基的保存表明,NOT1 MIF4G结构域在所有真核生物中都采用相似的折叠方式,并以相似的方式与CAF1相互作用。我们的发现揭示了CCR4-NOT复合物的组装,并为剖析NOT模块在mRNA死基化中的作用提供了基础。
The CCR4–NOT complex plays a crucial role in post-transcriptional mRNA regulation in eukaryotic cells. It catalyzes the removal of mRNA poly(A) tails, thereby repressing translation and committing mRNAs to decay. The conserved core of the complex consists of a catalytic module comprising two deadenylases (CAF1/POP2 and CCR4a/b) and the NOT module, which contains at least NOT1, NOT2 and NOT3. NOT1 bridges the interaction between the two modules and therefore, acts as a scaffold protein for the assembly of the complex. Here, we present the crystal structures of the CAF1-binding domain of human NOT1 alone and in complex with CAF1. The NOT1 domain comprises five helical hairpins that adopt an MIF4G (middle portion of eIF4G) fold. This NOT1 MIF4G domain binds CAF1 through a pre-formed interface and leaves the CAF1 catalytic site fully accessible to RNA substrates. The conservation of critical structural and interface residues suggests that the NOT1 MIF4G domain adopts a similar fold and interacts with CAF1 in a similar manner in all eukaryotes. Our findings shed light on the assembly of the CCR4–NOT complex and provide the basis for dissecting the role of the NOT module in mRNA deadenylation.
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影响因子: --
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影响因子: 14.9
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