Ubiquitin E3 Ligase c-Cbl Is a Host Negative Regulator of Nef Protein of HIV-1.

Ubiquitin E3 Ligase c-Cbl Is a Host Negative Regulator of Nef Protein of HIV-1.
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泛素 E3 连接酶 c-Cbl 是 HIV-1 Nef 蛋白的宿主负调节因子。

DOI:
10.3389/fmicb.2020.597972
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发表时间:
2020
影响因子:
5.2
通讯作者:
Qian F
Qian F
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang HG;Guo J;Yuan Y;Zuo Y;Liu J;Zhu L;Miao Y;Chen X;Jin L;Huang F;Ren T;He J;Shi W;Wen Z;Zhu C;Zheng H;Dong C;Qian F

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Nef是人类免疫缺陷病毒1型(human immunodeficiency virus type-1,HIV-1)编码的一种辅助蛋白,在HIV-1感染和病毒复制中起重要作用。有趣的是,HIV-1 Nef可以促进许多宿主蛋白的降解,从而破坏细胞的抗病毒免疫反应。然而,HIV-1 Nef如何被宿主因素降解仍然在很大程度上未被探索。在这里,我们确定c-Cbl作为宿主泛素E3连接酶的HIV-1 Nef。我们发现c-Cbl与Nef相互作用并降低HIV-1 Nef的蛋白水平。进一步的研究表明,c-Cbl促进HIV-1 Nef的Lys 48连接的多泛素化,从而减弱HIV-1 Nef的蛋白质稳定性。重要的是,细胞c-Cbl泛素化和降解HIV-1 NL 4 -3病毒体产生的Nef蛋白,并最终减弱HIV-1感染THP 1细胞的毒力。本研究揭示了HIV-1 Nef蛋白的泛素化和蛋白酶体依赖性降解机制,为抗HIV-1提供了潜在的策略。
Nef is an accessory protein encoded by human immunodeficiency virus type-1 (HIV-1) and plays important roles in regulating HIV-1 infection and viral replication. Interestingly, HIV-1 Nef can promote degradation of numerous host proteins to disrupt cellular antiviral immune response. However, how HIV-1 Nef is degraded by host factors remains largely unexplored. Here, we identified c-Cbl as a host ubiquitin E3 ligase of HIV-1 Nef. We found that c-Cbl interacts with Nef and reduces protein levels of HIV-1 Nef. Further studies demonstrated that c-Cbl promoted Lys48-linked polyubiquitination of HIV-1 Nef, thus attenuating protein stability of HIV-1 Nef. Importantly, cellular c-Cbl ubiquitinated and degraded Nef proteins produced by HIV-1 NL4-3 virions, and ultimately attenuated HIV-1 virulence for infection of THP1 cells. This study reveals a ubiquitination and proteasome-dependent degradation mechanism of HIV-1 Nef protein, and could provide potential strategies for fighting against HIV-1.
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