含有RD的多子单元复合体NELF与DSIF合作,抑制RNA聚合酶II延长
Y Yamaguchi1, T Takagi, T Wada
1Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan.
Cell
|April 13, 1999
概括
研究人员发现了一种新的蛋白质,负延长因子 (NELF),与DSIF一起作用,抑制RNA聚合酶II (pol II) 转录延长. P-TEFb扭转了这种压制,揭示了一个关键的监管网络.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 生物化学 生物化学
背景情况:
- DRB是一种已知的RNA聚合酶II (pol II) 转录延长的抑制剂.
- 两个延长因子,DSIF和P-TEFb,对于DRB在极点II的行动至关重要.
- 了解pol II延长因子对于理解基因调节至关重要.
研究的目的:
- 识别和描述涉及DRB敏感转录的新型蛋白质因子.
- 阐明DRB作用的分子机制及其调节网络.
- 为了研究一个新发现的因素在极II延长中的作用.
主要方法:
- 从HeLa核提取物中净化蛋白质因子.
- 生物化学测试以评估转录延长活性.
- 蛋白质成分及其相互作用的识别.
主要成果:
- 第三个蛋白质因子,负延长因子 (NELF) 被确定并净化.
- NELF与DSIF合作,大力压制波II的延伸.
- 通过pol II C终端域酸化,P-TEFb可以逆转NELF/DSIF介导的抑制.
- NELF包括五种多,包括RD蛋白.
结论:
- 这项研究揭示了DRB在转录延长中的作用的分子机制.
- 一个涉及负延长因子 (NELF),DSIF和P-TEFb的监管网络控制了极II延长.
- 这些发现为复杂的基因转录调节提供了新的见解.
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