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染色体重塑辅助因子对联体激活转录的选择性
1Department of Molecular and Cell Biology, Howard Hughes Medical Institute, 401 Barker Hall, University of California, Berkeley, CA 94720-3204, USA.
研究人员确定了PBAF辅因子,这对基因转录中的核激素受体活性至关重要. 像人类SWI/SNF这样的相关复合体没有显示这种增强,突出显示了基因调节中的功能选择性.
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:
- 细胞基因转录是由调节性蛋白质和辅因子指导的.
- 在动物和细胞中间接评估辅因子功能存在挑战.
研究的目的:
- 净化和识别核激素受体介导基因转录所必需的多子单元辅因子.
- 为了研究相关的染色体重塑复合物的功能选择性.
主要方法:
- 采用了综合色素依赖的复合转录反应.
- 净化并确定了一个多个子单位的辅因子 (PBAF).
- 评估了PBAF,人类SWI/SNF和ACF对转录的影响.
主要成果:
- 确定了PBAF作为核激素受体对依赖联体的交换激活的必要辅因子.
- 证明人类的SWI/SNF和ACF并不能强化这种特定的转录激活.
- 表明核激素受体的激活需要与TATA结合蛋白 (TBP) 相关的因子 (TAF) 和ARC/CRSP辅因子.
结论:
- PBAF是核激素受体介导转录的关键辅因子.
- 在相关的染色体重塑复合体中存在功能选择性.
- 定义了一个更完整的转录激活因子集.
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