HIV-1 Exploits the Host Factor RuvB-like 2 to Balance Viral Protein Expression.

HIV-1 Exploits the Host Factor RuvB-like 2 to Balance Viral Protein Expression.
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DOI:
10.1016/j.chom.2015.06.018
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发表时间:
2015-08
影响因子:
30.3
通讯作者:
X. Mu;Yajing Fu;Yiping Zhu;Xinlu Wang;Y. Xuan;H. Shang;S. Goff;G. Gao
X. Mu;Yajing Fu;Yiping Zhu;Xinlu Wang;Y. Xuan;H. Shang;S. Goff;G. Gao
中科院分区:
医学1区
文献类型:
--
作者:
X. Mu;Yajing Fu;Yiping Zhu;Xinlu Wang;Y. Xuan;H. Shang;S. Goff;G. Gao

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HIV-1 结构蛋白 Gag 与包膜蛋白 (Env) 的正确比例对于最大病毒粒子感染性非常重要。病毒如何确保以适当的比例产生 Gag 和 Env 蛋白仍然未知。我们报告说,HIV-1 利用宿主因子 RuvB-like 2 (RVB2) 来平衡 Gag 和 Env 的相对表达,从而有效产生感染性病毒粒子。 RVB2 通过与 Gag 蛋白编码的 Matrix (MA) 结构域和翻译 mRNA 的 5' UTR 相互作用并以翻译依赖性方式促进 mRNA 降解来抑制 Gag 表达。 RVB2 的这种抑制活性通过与 MA 的竞争性相互作用而被 Env 拮抗,从而在 Env 水平足以进行病毒粒子组装时允许 Gag 合成进行。在 HIV-1 阳性患者中,RVB2 水平与病毒载量和疾病进展状态呈正相关。这些发现揭示了 HIV-1 调节其蛋白质表达的机制。
The correct ratio of the HIV-1 structural protein Gag to the envelope protein (Env) is important for maximal virion infectivity. How the virus ensures the production of Gag and Env proteins in an appropriate ratio remains unknown. We report that HIV-1 exploits the host factor RuvB-like 2 (RVB2) to balance relative expression of Gag and Env for efficient production of infectious virions. RVB2 inhibits Gag expression by interacting with both the encoded Matrix (MA) domain of Gag protein and 5′ UTR of the translating mRNA and promoting mRNA degradation in a translation-dependent manner. This inhibitory activity of RVB2 is antagonized by Env through competitive interaction with MA, allowing Gag synthesis to proceed when Env levels are adequate for virion assembly. In HIV-1-positive patients, RVB2 levels positively correlate with viral loads and disease progression status. These findings reveal a mechanism by which HIV-1 regulates its protein expression.