The interaction between the hepatitis C proteins NS4B and NS5A is involved in viral replication.

The interaction between the hepatitis C proteins NS4B and NS5A is involved in viral replication.
复制标题

丙型肝炎蛋白NS4B和NS5A之间的相互作用参与病毒复制。

DOI:
10.1016/j.virol.2014.10.021
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发表时间:
2015-01-15
期刊:
影响因子:
3.7
通讯作者:
Sklan, Ella H.
Sklan, Ella H.
中科院分区:
医学3区
文献类型:
--
作者:
David, Naama;Yaffe, Yakey;Hagoel, Lior;Elazar, Menashe;Glenn, Jeffrey S.;Hirschberg, Koret;Sklan, Ella H.

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丙型肝炎病毒(HCV)在膜相关的高度有序的复制复合体(RC)中复制。这些复合体包括病毒和宿主蛋白,是病毒RNA基因组复制所必需的。这些RCS形成的基础是病毒和宿主蛋白之间的相互作用网络,目前还没有完全确定。在这里,我们研究了NS4B和NS5A这两个关键RC组件之间的关联。我们用荧光共振能量转移和哺乳动物双杂交系统表征了这些蛋白质之间的相互作用。NS4B的C-末端结构域(CTD)中的特定色氨酸残基介导了这种相互作用。NS5A的结构域I足以调节其与NS4B的相互作用。NS4B CTD色氨酸残基的突变消除了病毒的复制。此外,其中一个突变还影响NS5A的过度磷酸化。这些发现为NS4B-NS5A相互作用的重要性提供了新的见解,并为研究复制酶亚单位之间的复杂相互作用提供了一个起点。
Hepatitis C virus (HCV) replicates in membrane associated, highly ordered replication complexes (RCs). These complexes include viral and host proteins necessary for viral RNA genome replication. The interaction network among viral and host proteins underlying the formation of these RCs is yet to be thoroughly characterized. Here, we investigated the association between NS4B and NS5A, two critical RC components. We characterized the interaction between these proteins using fluorescence resonance energy transfer and a mammalian two-hybrid system. Specific tryptophan residues within the C-terminal domain (CTD) of NS4B were shown to mediate this interaction. Domain I of NS5A, was sufficient to mediate its interaction with NS4B. Mutations in the NS4B CTD tryptophan residues abolished viral replication. Moreover, one of these mutations also affected NS5A hyperphosphorylation. These findings provide new insights into the importance of the NS4B–NS5A interaction and serve as a starting point for studying the complex interactions between the replicase subunits.
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