HPat provides a link between deadenylation and decapping in metazoa.

HPat provides a link between deadenylation and decapping in metazoa.
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DOI:
10.1083/jcb.200910141
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发表时间:
2010-04-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Izaurralde E
Izaurralde E
中科院分区:
其他
文献类型:
--
作者:
Haas G;Braun JE;Igreja C;Tritschler F;Nishihara T;Izaurralde E

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果蝇Pat1同源物中富含脯氨酸的区域与蛋白质的c端结构域协同作用,以招募脱帽酶和deadenylase复合物来靶向mrna。真核信使rna (mrna)的脱帽发生在它们经历死基化之后,但这些过程是如何协调的尚不清楚。在这项研究中,我们报道了果蝇HPat (Pat1的同源物),一种保守的脱壳激活因子,与其他脱壳因子(如Me31B, LSm1-7复合物和脱壳酶DCP2)和CCR4-NOT死烯酶复合物的组分相互作用。因此,当人工连接到mRNA报告基因时,HPat会触发死蛋白化和脱帽。出乎意料的是,这些活动发生在脯氨酸丰富的地区。然而,在内源性HPat缺失的细胞中,该区域不能单独恢复脱帽,还需要HPat的中间(Mid)和非常c端结构域。我们进一步表明,Mid和c端结构域介导HPat招募到目标mrna。我们的研究结果揭示了后生动物HPat的脯氨酸丰富区域和c端结构域在mRNA脱壳中前所未有的作用,并表明HPat是体内脱壳与死基化耦合的细胞机制的一个组成部分。
A proline-rich region in the Drosophila Pat1 homologue works with the protein's C-terminal domain to recruit decapping and deadenylase complexes to target mRNAs. Decapping of eukaryotic messenger RNAs (mRNAs) occurs after they have undergone deadenylation, but how these processes are coordinated is poorly understood. In this study, we report that Drosophila melanogaster HPat (homologue of Pat1), a conserved decapping activator, interacts with additional decapping factors (e.g., Me31B, the LSm1–7 complex, and the decapping enzyme DCP2) and with components of the CCR4–NOT deadenylase complex. Accordingly, HPat triggers deadenylation and decapping when artificially tethered to an mRNA reporter. These activities reside, unexpectedly, in a proline-rich region. However, this region alone cannot restore decapping in cells depleted of endogenous HPat but also requires the middle (Mid) and the very C-terminal domains of HPat. We further show that the Mid and C-terminal domains mediate HPat recruitment to target mRNAs. Our results reveal an unprecedented role for the proline-rich region and the C-terminal domain of metazoan HPat in mRNA decapping and suggest that HPat is a component of the cellular mechanism that couples decapping to deadenylation in vivo.
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