Structural basis for LeishIF4E-1 modulation by an interacting protein in the human parasite Leishmania major.

Structural basis for LeishIF4E-1 modulation by an interacting protein in the human parasite Leishmania major.
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DOI:
10.1093/nar/gky194
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发表时间:
2018-04-20
影响因子:
14.9
通讯作者:
Léger-Abraham M
Léger-Abraham M
中科院分区:
生物学2区
文献类型:
--
作者:
Meleppattu S;Arthanari H;Zinoviev A;Boeszoermenyi A;Wagner G;Shapira M;Léger-Abraham M

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利什曼原虫是一种单细胞病原体,通过被感染的白蛉叮咬传播给人类。它们基因表达的调控大多发生在转录后,在翻译水平上调节寄生虫整个生命周期所需的不同基因表达模式。本文报道了利什曼原虫帽结合异构体1 LeishIF4E-1的x射线晶体结构,该异构体与一个先前未知功能的蛋白质片段Leish4E-IP1结合,该片段与LeishIF4E-1紧密结合。分子结构、核磁共振光谱实验和体外帽结合实验表明,Leish4E-IP1变结构破坏了LeishIF4E-1与5 ' mRNA帽的结合。我们提出了Leish4E-IP1介导的LeishIF4E-1抑制调节人类寄生虫翻译起始的机制。
Leishmania parasites are unicellular pathogens that are transmitted to humans through the bite of infected sandflies. Most of the regulation of their gene expression occurs post-transcriptionally, and the different patterns of gene expression required throughout the parasites’ life cycle are regulated at the level of translation. Here, we report the X-ray crystal structure of the Leishmania cap-binding isoform 1, LeishIF4E-1, bound to a protein fragment of previously unknown function, Leish4E-IP1, that binds tightly to LeishIF4E-1. The molecular structure, coupled to NMR spectroscopy experiments and in vitro cap-binding assays, reveal that Leish4E-IP1 allosterically destabilizes the binding of LeishIF4E-1 to the 5′ mRNA cap. We propose mechanisms through which Leish4E-IP1-mediated LeishIF4E-1 inhibition could regulate translation initiation in the human parasite.
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