Vif hijacks CBF-β to degrade APOBEC3G and promote HIV-1 infection.

Vif hijacks CBF-β to degrade APOBEC3G and promote HIV-1 infection.
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DOI:
10.1038/nature10693
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发表时间:
2011-12-21
期刊:
影响因子:
64.8
通讯作者:
Krogan, Nevan J.
Krogan, Nevan J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Jaeger, Stefanie;Kim, Dong Young;Hultquist, Judd F.;Shindo, Keisuke;LaRue, Rebecca S.;Kwon, Eunju;Li, Ming;Anderson, Brett D.;Yen, Linda;Stanley, David;Mahon, Cathal;Kane, Joshua;Franks-Skiba, Kathy;Cimermancic, Peter;Burlingame, Alma;Sali, Andrej;Craik, Charles S.;Harris, Reuben S.;Gross, John D.;Krogan, Nevan J.

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限制因子,如逆转录病毒互补DNA脱氨酶APOBEC 3G,是主要阻断病毒复制的细胞蛋白。艾滋病病毒,人类免疫缺陷病毒1型(HIV-1),产生辅助因子Vif,其通过劫持泛素连接酶复合物(含有CUL 5、CUL 2C、CUL 2B和RING盒蛋白)并靶向APOBEC 3G进行降解来抵消宿主的抗病毒防御。在这里,我们揭示,使用亲和标签/纯化质谱法的方法,Vif额外招募转录辅因子CBF-β到这个泛素连接酶复合物。CBF-β通常与RUNX DNA结合蛋白协同作用,允许重组六蛋白组装体的重建,该重组六蛋白组装体与APOBEC 3G而不是相关的脱氨酶APOBEC 3A一起增强特异性聚泛素化活性。使用RNA敲除和遗传互补研究,我们还证明了CBF-β是Vif介导的APOBEC 3G降解所必需的,因此也是保持HIV-1感染性所必需的。最后,猴免疫缺陷病毒(SIV)Vif也结合并需要CBF-β来降解恒河猴APOBEC 3G,表明功能保守。破坏CBF-β-Vif相互作用的方法可能使HIV-1限制成为可能,并为目前主要靶向病毒蛋白的抗病毒治疗提供补充。
Restriction factors, such as the retroviral complementary DNA deaminase APOBEC3G, are cellular proteins that dominantly block virus replication. The AIDS virus, human immunodeficiency virus type 1 (HIV-1), produces the accessory factor Vif, which counteracts the host’s antiviral defence by hijacking a ubiquitin ligase complex, containing CUL5, ELOC, ELOB and a RING-box protein, and targeting APOBEC3G for degradation. Here we reveal, using an affinity tag/purification mass spectrometry approach, that Vif additionally recruits the transcription cofactor CBF-β to this ubiquitin ligase complex. CBF-β, which normally functions in concert with RUNX DNA binding proteins, allows the reconstitution of a recombinant six-protein assembly that elicits specific polyubiquitination activity with APOBEC3G, but not the related deaminase APOBEC3A. Using RNA knockdown and genetic complementation studies, we also demonstrate that CBF-β is required for Vif-mediated degradation of APOBEC3G and therefore for preserving HIV-1 infectivity. Finally, simian immunodeficiency virus (SIV) Vif also binds to and requires CBF-β to degrade rhesus macaque APOBEC3G, indicating functional conservation. Methods of disrupting the CBF-β–Vif interaction might enable HIV-1 restriction and provide a supplement to current antiviral therapies that primarily target viral proteins.
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