The LARP1 La-Module recognizes both ends of TOP mRNAs.

The LARP1 La-Module recognizes both ends of TOP mRNAs.
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DOI:
10.1080/15476286.2019.1669404
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发表时间:
2021-03
期刊:
影响因子:
4.1
通讯作者:
Berman AJ
Berman AJ
中科院分区:
生物学3区
文献类型:
--
作者:
Al-Ashtal HA;Rubottom CM;Leeper TC;Berman AJ

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LA相关蛋白1(LARP1)是一种RNA结合蛋白,调节编码翻译机制的mRNAs的稳定性和翻译,包括核糖体蛋白和翻译因子。这些mRNA的特征是一个5ʹ末端的寡嘧啶(TOP)基序,协调它们的时间和化学计量表达。虽然LARP1通过C-末端DM15区域抑制TOP mRNA的翻译,但N-末端La-模块在TOP mRNA的识别和翻译调控中的作用仍然不清楚。在这里,我们证明了LARP1La-模块也能结合顶端基序,尽管是以帽不依赖的方式。我们还证明了它能识别Poly(A)RNA。此外,我们的数据表明,LARP1La-模块可以同时与顶端基序和Poly(A)RNA结合。这些结果唤起了一个有趣的分子机制,通过这个机制,LARP1可以调节顶端转录本的翻译和稳定。
La-Related Protein 1 (LARP1) is an RNA-binding protein that regulates the stability and translation of mRNAs encoding the translation machinery, including ribosomal proteins and translation factors. These mRNAs are characterized by a 5ʹ-terminal oligopyrimidine (TOP) motif that coordinates their temporal and stoichiometric expression. While LARP1 represses TOP mRNA translation via the C-terminal DM15 region, the role of the N-terminal La-Module in the recognition and translational regulation of TOP mRNAs remains elusive. Herein we show that the LARP1 La-Module also binds TOP motifs, although in a cap-independent manner. We also demonstrate that it recognizes poly(A) RNA. Further, our data reveal that the LARP1 La-Module can simultaneously engage TOP motifs and poly(A) RNA. These results evoke an intriguing molecular mechanism whereby LARP1 could regulate translation and stabilization of TOP transcripts.
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