N-Terminal Acetylation by NatB Is Required for the Shutoff Activity of Influenza A Virus PA-X.

N-Terminal Acetylation by NatB Is Required for the Shutoff Activity of Influenza A Virus PA-X.
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DOI:
10.1016/j.celrep.2018.06.078
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发表时间:
2018-07-24
期刊:
影响因子:
8.8
通讯作者:
Kawaoka Y
Kawaoka Y
中科院分区:
生物学1区
文献类型:
--
作者:
Oishi K;Yamayoshi S;Kozuka-Hata H;Oyama M;Kawaoka Y

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N-末端乙酰化是真核生物中一种主要的翻译后修饰,由N-末端乙酰转移酶(NATs)催化。虽然N-末端乙酰化调节不同的蛋白质功能,但对其在病毒复制中的作用知之甚少。我们发现,NatB,其中包括NAA 20和NAA 25,参与流感病毒PA-X的关闭活动。在NatB缺陷细胞中PA-X的关闭活性被抑制,并且不被NatB乙酰化的PA-X突变体显示出降低的关闭活性。我们还评估了PA的N-末端乙酰化的重要性,因为PA-X与PA共享其N-末端序列。病毒聚合酶活性降低NatB缺陷细胞。此外,未被NatB乙酰化的突变PA在病毒聚合酶复合物中失去了它们的功能。总之,我们的研究结果表明,N-末端乙酰化是PA-X的关闭活性和病毒聚合酶活性所需的。
N-terminal acetylation is a major posttranslational modification in eukaryotes catalyzed by N-terminal acetyltransferases (NATs), NatA through NatF. Although N-terminal acetylation modulates diverse protein functions, little is known about its roles in virus replication. We found that NatB, which comprises NAA20 and NAA25, is involved in the shutoff activity of influenza virus PA-X. The shutoff activity of PA-X was suppressed in NatB-deficient cells, and PA-X mutants that are not acetylated by NatB showed reduced shutoff activities. We also evaluated the importance of N-terminal acetylation of PA, because PA-X shares its N-terminal sequence with PA. Viral polymerase activity was reduced in NatB-deficient cells. Moreover, mutant PAs that are not acetylated by NatB lost their function in the viral polymerase complex. Taken together, our findings demonstrate that N-terminal acetylation is required for the shutoff activity of PA-X and for viral polymerase activity.
流感A病毒表达中使用的核糖体框架发生在序列UCC_UUU_CGU内,并且位于+1方向。
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