转录因子CREB中的蛋白激酶A依赖激活剂揭示了CREM抑制剂的新作用
P Brindle1, S Linke, M Montminy
1Clayton Foundation Laboratories for Peptide Biology, Salk Institute, La Jolla, California 92037.
Nature
|August 26, 1993
概括
激素信号通过酸化其酶诱导域 (KID) 来激活CREB转录因子. 这种酸化增强了基因转录,即使KID在单独的分子上.
科学领域:
- 分子生物学分子生物学
- 细胞信号传输 细胞信号传输
背景情况:
- 循环AMP (cAMP) 是细胞信号通路中的关键第二信使.
- 转录因子CREB (cAMP反应元素结合蛋白) 调节对cAMP的反应中的基因表达.
- 通过蛋白激酶A对CREB在氨酸133的酸化对其转录活性至关重要.
研究的目的:
- 研究CREB的酶诱导域 (KID) 在调解cAMP诱导的转录激活中的作用.
- 确定KID是否可以将cAMP诱导性赋予其他转录激活域.
- 探索KID作为一种新型条件转录激活剂类别的潜力.
主要方法:
- 为了测试CREB KID的功能,创建了融合蛋白构造.
- 该KID与异质激活域 (CREB Q2,GAL4,GCN4) 相连.
- 记者基因测试被用来测量对cAMP刺激的反应中的转录活性.
主要成果:
- 仅CREB KID就足以赋予cAMP诱导的转录激活.
- 当KID与不同的激活域融合时,观察到这种效应.
- 该KID的功能是独立于其细胞内定位或DNA结合活性.
- 值得注意的是,KID保留了它的功能,即使在与邻近的促进器位点连接到单独的多.
结论:
- 该KID是一个关键的功能域中介CREB对cAMP的反应.
- KID代表了条件转录激活的新机制.
- 这个域可能通过与其他促进体结合的因素相互作用来增强基因表达而起作用.
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