哺乳动物Srb/Mediator复合体是腺病毒E1A蛋白质的目标
T G Boyer1, M E Martin, E Lees
1Molecular Biology Institute, UCLA, Los Angeles, California 90095-1570, USA.
Nature
|June 3, 1999
概括
腺病毒E1A蛋白与包括SUR-2在内的人类中间体综合体相互作用,以激活病毒基因转录. 这种相互作用对于病毒复制和细胞过程至关重要.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 细胞生物学 细胞生物学
背景情况:
- 腺病毒E1A蛋白对于病毒复制至关重要,促进细胞周期进展和病毒转录.
- E1A蛋白与RB和CBP等细胞调节蛋白相互作用,以实现这些效应.
研究的目的:
- 研究E1A指域激活病毒早期基因转录的机制.
- 为了确定参与E1A介导的转录激活的宿主细胞因子.
主要方法:
- 生物化学测试用于研究蛋白质与蛋白质相互作用.
- 在试管体内转录测试使用纯化的成分.
- 使用酵母 Srb/Mediator 蛋白质同类的蛋白质复合物的分析.
主要成果:
- E1A指域与宿主细胞中的多蛋白复合体结合,其中含有酵母Srb/Mediator蛋白的同类.
- 这种相互作用涉及到对人类SUR-2的稳定结合,这是C. elegansSUR-2的同类.
- 已确定的人类Srb/Mediator复合体刺激体外转录以响应E1A和VP16激活域.
- 人类Sur-2相互作用也是通过MAP激酶信号的ETS家族转录因子激活所必需的.
结论:
- E1A指域利用宿主细胞Srb/Mediator复合体,包括人类SUR-2,来激活病毒早期基因转录.
- 这一发现揭示了病毒转录控制的新机制,并突出了保存细胞机械在病毒过程中的作用.
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