过早转录终结复合体蛋白PCF11和WDR82在潜伏感染细胞中沉默HIV-1表达
Melissa Ait Said1, Fabienne Bejjani1, Ahmed Abdouni1
1Université Paris Cité, Institut Cochin, INSERM, CNRS, Paris F-75014, France.
概括
分裂和多化因子PCF11和WDR82蛋白质复合体通过控制过早的转录终止,使潜伏感染细胞的HIV-1转录沉默. 击败PCF11或WDR82会重新激活HIV-1的表达.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 基因规则 基因规则
背景情况:
- 艾滋病毒-1的潜伏时间是通过整合后的转录沉默来确定的.
- 隐性HIV-1中RNA聚合酶II (RNAPII) 暂停和过早转录终止 (PTT) 的机制尚未完全理解.
研究的目的:
- 调查裂变和多化 (CPA) 因素在潜伏期间调节HIV-1转录中的作用.
- 确定参与控制潜感染细胞中的HIV-1基因表达的新型因素.
主要方法:
- 研究了PCF11在HIV-1转录中的功能.
- 研究了PCF11和WDR82.2.之间的相互作用.
- 在潜伏感染的细胞中利用了敲击实验.
- 分析了PCF11和WDR82的招募到前病毒性促进器近位区域.
主要成果:
- CPA因子PCF11抑制HIV-1的表达,而不依赖于其他CPA子单元或多基化信号.
- PCF11与RNAPII结合蛋白WDR82.2进行相互作用.
- 击败PCF11或WDR82会在潜伏感染的细胞中重新激活HIV-1的表达.
- PCF11和WDR82以相互依赖的方式被招募到HIV-1促销器附近区域,以沉默转录.
结论:
- PCF11和WDR82形成了一个过早的转录终止复合体,使潜伏感染细胞中的HIV-1表达沉默.
- 这种PCF11/WDR82复合体代表了一种用于控制潜伏期HIV-1基因表达的新机制.
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