HIV-1 Nef interacts with the cyclin K/CDK13 complex to antagonize SERINC5 for optimal viral infectivity.

HIV-1 Nef interacts with the cyclin K/CDK13 complex to antagonize SERINC5 for optimal viral infectivity.
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HIV-1 Nef与细胞周期蛋白K/CDK 13复合物相互作用,拮抗SERINC 5,以获得最佳病毒感染性。

DOI:
10.1016/j.celrep.2021.109514
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发表时间:
2021-08-10
期刊:
影响因子:
8.8
通讯作者:
Zheng YH
Zheng YH
中科院分区:
生物学1区
文献类型:
--
作者:
Chai Q;Li S;Collins MK;Li R;Ahmad I;Johnson SF;Frabutt DA;Yang Z;Shen X;Sun L;Hu J;Hultquist JF;Peterlin BM;Zheng YH

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HIV-1阴性因子(Nef)蛋白通过将丝氨酸蛋白酶5(SERINC 5)重定向到内体和溶酶体进行降解来拮抗这种有效的限制因子。然而,确切的机制仍不清楚。使用亲和纯化/质谱,我们确定细胞周期蛋白K(CycK)和细胞周期蛋白依赖性激酶13(CDK 13)作为Nef相关的激酶复合物。CycK/CDK 13磷酸化SERINC 5中位置360(S360)处的丝氨酸,这是Nef从细胞表面下调SERINC 5及其对抗SERINC 5抗病毒活性所需的。为了了解S360磷酸化的作用,我们产生了CD 8和SERINC 5之间的嵌合蛋白,以研究它们对Nef的反应。Nef不仅下调,而且重要的是,还以S360依赖的方式与这种嵌合体结合。因此,S360磷酸化增加Nef和SERINC 5之间的相互作用,并通过内吞机制启动SERINC 5的破坏。Chai等人表明CycK/CDK 13是Nef相关的丝氨酸激酶复合物。他们通过鉴定S360作为SERINC 5磷酸化位点,提供了Nef如何通过内吞机制拮抗SERINC 5以获得最佳HIV-1感染性的额外见解,这是其与Nef结合及其随后下调所必需的。
HIV-1-negative factor (Nef) protein antagonizes serine incorporator 5 (SERINC5) by redirecting this potent restriction factor to the endosomes and lysosomes for degradation. However, the precise mechanism remains unclear. Using affinity purification/mass spectrometry, we identify cyclin K (CycK) and cyclin-dependent kinase 13 (CDK13) as a Nef-associated kinase complex. CycK/CDK13 phosphorylates the serine at position 360 (S360) in SERINC5, which is required for Nef downregulation of SERINC5 from the cell surface and its counteractivity of the SERINC5 antiviral activity. To understand the role of S360 phosphorylation, we generate chimeric proteins between CD8 and SERINC5 to study their response to Nef. Nef not only downregulates but, importantly, also binds to this chimera in an S360-dependent manner. Thus, S360 phosphorylation increases interactions between Nef and SERINC5 and initiates the destruction of SERINC5 by the endocytic machinery. Chai et al. show that CycK/CDK13 is a Nef-associated serine kinase complex. They provide additional insights into how Nef antagonizes SERINC5 via the endocytic machinery for optimal HIV-1 infectivity by identifying S360 as the SERINC5 phosphorylation site, which is required for its binding to Nef and its subsequent downregulation.
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