CBFβ stabilizes HIV Vif to counteract APOBEC3 at the expense of RUNX1 target gene expression.

CBFβ stabilizes HIV Vif to counteract APOBEC3 at the expense of RUNX1 target gene expression.
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DOI:
10.1016/j.molcel.2012.12.012
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发表时间:
2013-02-21
期刊:
影响因子:
16
通讯作者:
Gross, John D.
Gross, John D.
中科院分区:
生物学1区
文献类型:
--
作者:
Kim, Dong Young;Kwon, Eunju;Hartley, Paul D.;Crosby, David C.;Mann, Sumanjit;Krogan, Nevan J.;Gross, John D.

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HIV-1辅助蛋白Vif劫持了一种细胞剔除环泛素连接酶CRL5,以促进APOBEC3限制因子家族的降解。最近,细胞转录辅助因子Cbfβ被证明与CRL5-Vif形成复合体,对ApoBEC3的降解和病毒的感染性是必不可少的。我们现在证明了Cbfβ是通过抑制Vif齐聚和通过直接相互作用激活CRL5-Vif来组装有序的CRL5-Vif复合体所必需的。CRL5-Vif-Cbfβ全酶形成了一个明确的杂六角体,表明Vif同时劫持了CRL5和Cbfβ。CBFβ和RUNX转录因子的异源二聚体有助于调节基因,包括那些具有免疫系统功能的基因。我们发现Vif与CBFβ的结合是RUNX异二聚化的互斥,并影响其调节域与RUNX1相关的基因的表达。我们的结果提供了一种机制,通过这种机制,具有有限编码能力的病原体可以使用一个因子劫持多个宿主路径。
The HIV-1 accessory protein Vif hijacks a cellular cullin-RING ubiquitin ligase, CRL5, to promote degradation of the APOBEC3 family of restriction factors. Recently, the cellular transcription cofactor CBFβ was shown to form a complex with CRL5-Vif and be essential for APOBEC3 degradation and viral infectivity. We now demonstrate that CBFβ is required for assembling a well-ordered CRL5-Vif complex by inhibiting Vif oligomerization and activating CRL5-Vif by direct interaction. The CRL5-Vif-CBFβ holoenzyme forms a well-defined heterohexamer, indicating that Vif simultaneously hijacks CRL5 and CBFβ. Heterodimers of CBFβ and RUNX transcription factors contribute towards the regulation of genes, including those with immune system functions. We show that binding of Vif to CBFβ is mutually exclusive of RUNX heterodimerization and impacts expression of genes whose regulatory domains are associated with RUNX1. Our results provide a mechanism by which a pathogen with limiting coding capacity uses one factor to hijack multiple host pathways.
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