HCV IRES manipulates the ribosome to promote the switch from translation initiation to elongation.

HCV IRES manipulates the ribosome to promote the switch from translation initiation to elongation.
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DOI:
10.1038/nsmb.2465
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发表时间:
2013-02
影响因子:
16.8
通讯作者:
Kieft, Jeffrey S.
Kieft, Jeffrey S.
中科院分区:
生物学1区
文献类型:
--
作者:
Filbin, Megan E.;Vollmar, Breanna S.;Shi, Dan;Gonen, Tamir;Kieft, Jeffrey S.

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丙型肝炎病毒(HCV)内部核糖体进入位点(IRES)驱动病毒复制所必需的蛋白质合成的非规范起始。HCV IRES功能研究主要集中在80 S核糖体的形成,但尚未探索80 S核糖体在起始密码子处的作用。在这里,我们报告说,IRES结构域的突变停靠在40 S亚基的解码槽,并导致IRES结构的局部扰动导致IRES-兔40 S亚基复合物的构象变化。在功能上,我们发现突变通过抑制第一个核糖体易位事件来降低IRES活性,并且建模表明这种作用是通过与单个核糖体蛋白的相互作用来实现的。HCV IRES操纵核糖体的能力提供了对核糖体的结构和功能如何被结合的RNA改变的见解,包括来自细胞入侵者的RNA。
The hepatitis C virus (HCV) internal ribosome entry site (IRES) drives non-canonical initiation of protein synthesis necessary for viral replication. HCV IRES functional studies have focused on 80S ribosome formation, but have not explored roles after the 80S ribosome is poised at the start codon. Here, we report that mutations of an IRES domain that docks in the 40S subunit’s decoding groove and cause only a local perturbation in IRES structure result in conformational changes in the IRES-rabbit 40S subunit complex. Functionally, we find the mutation decreases IRES activity by inhibiting the first ribosome translocation event, and modeling suggests that this effect is through an interaction with a single ribosomal protein. The HCV IRES’ ability to manipulate the ribosome provides insight into how the ribosome’s structure and function can be altered by bound RNAs, including those derived from cellular invaders.
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