维夫劫持CBF-β降低APOBEC3G和促进HIV-1感染
Stefanie Jäger1, Dong Young Kim, Judd F Hultquist
1Department of Cellular and Molecular Pharmacology, University of California-San Francisco, San Francisco, California 94158, USA.
Nature
|December 23, 2011
概括
人类免疫缺陷病毒1型 (HIV-1) Vif蛋白质劫持细胞机械,降解APOBEC3G,这是一个关键的抗病毒因素. 这项研究揭示了转录辅因子CBF-β对于这一过程至关重要,提供了潜在的治疗点.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 像APOBEC3G这样的细胞限制因素抑制病毒复制.
- 人类免疫缺陷病毒1型 (HIV-1) Vif蛋白通过向APOBEC3G进行降解来抵消这种防御.
- 这种被Vif劫持的泛素酶复合体包括CUL5,ELOC,ELOB和一个RING-box蛋白.
研究的目的:
- 为了识别HIV-1Vif对ubiquitin结合酶复合体招募的额外宿主因子.
- 阐明这些因素在APOBEC3G降解和病毒感染性中的作用.
- 为了研究这种机制在 Simian Immunodeficiency Virus (SIV) 中的保存.
主要方法:
- 亲和标签/净化质谱测试用于识别VIF相互作用的蛋白质.
- 复合性六蛋白组合的复合,用于体外活性测定.
- RNA淘汰和遗传补充研究,以评估蛋白质功能 in vivo.
- 研究SIV Vif与APOBEC3G和CBF-β的相互作用.
主要成果:
- 艾滋病毒-1 Vif将转录辅因子CBF-β招募到基于CUL5的全域基酶复合体中.
- CBF-β是Vif-ligase复合体对APOBEC3G的特定多比基因化和降解所需的.
- CBF-β对于HIV-1感染性至关重要,因为它可以通过Vif介导APOBEC3G降解.
- 此外,SIV Vif还利用CBF-β来降解 rhesus APOBEC3G,证明了功能性保护.
结论:
- CBF-β是HIV-1 Vif介导的APOBEC3G降解的关键宿主辅因子.
- 破坏CBF-β-Vif相互作用代表了针对HIV-1的潜在治疗策略.
- 这一发现突显了灵长类林氏病毒中病毒逃逸的保存机制.
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