Influenza A virus NS1 targets the ubiquitin ligase TRIM25 to evade recognition by the host viral RNA sensor RIG-I.

Influenza A virus NS1 targets the ubiquitin ligase TRIM25 to evade recognition by the host viral RNA sensor RIG-I.
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DOI:
10.1016/j.chom.2009.04.006
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发表时间:
2009-05-08
影响因子:
30.3
通讯作者:
García-Sastre A
García-Sastre A
中科院分区:
医学1区
文献类型:
--
作者:
Gack MU;Albrecht RA;Urano T;Inn KS;Huang IC;Carnero E;Farzan M;Inoue S;Jung JU;García-Sastre A

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TRIM 25介导病毒RNA传感器RIG-I的N-末端CARD的Lys 63-连接的泛素化,导致I型干扰素(IFN)产生。在这里,我们报告说,甲型流感病毒非结构蛋白1(NS 1)特异性抑制TRIM 25介导的RIG-I CARD泛素化,从而抑制RIG-I信号转导。NS 1中包含E96/E97残基的新结构域介导其与TRIM 25的卷曲螺旋结构域的相互作用,从而阻断TRIM 25多聚化和RIG-I CARD泛素化。此外,表达E96 A/E97 A NS 1突变体的重组甲型流感病毒在阻断TRIM 25介导的抗病毒IFN应答方面有缺陷,并且在小鼠中丧失毒力。我们的发现揭示了流感病毒抑制宿主IFN应答的新机制,也强调了TRIM 25在调节病毒感染中的重要作用。
TRIM25 mediates Lys 63-linked ubiquitination of the N-terminal CARDs of the viral RNA sensor RIG-I, leading to type I interferon (IFN) production. Here, we report that the influenza A virus non-structural protein 1 (NS1) specifically inhibits TRIM25-mediated RIG-I CARD ubiquitination, thereby suppressing RIG-I signal transduction. A novel domain in NS1 comprising E96/E97 residues mediates its interaction with the coiled-coil domain of TRIM25, thus blocking TRIM25 multimerization and RIG-I CARD ubiquitination. Furthermore, a recombinant influenza A virus expressing an E96A/E97A NS1 mutant is defective in blocking TRIM25-mediated anti-viral IFN response and loses virulence in mice. Our findings reveal a novel mechanism of influenza virus to inhibit host IFN response and also emphasize the vital role of TRIM25 in modulating viral infections.
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