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
中科院分区:
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
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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