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:
影响因子:
--
通讯作者:
Izaurralde E
中科院分区:
文献类型:
--
作者:
Haas G;Braun JE;Igreja C;Tritschler F;Nishihara T;Izaurralde E
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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