在cAMP诱导后的转录衰减需要PP-1-介导的CREB脱化
M Hagiwara1, A Alberts, P Brindle
1Clayton Foundation Laboratories for Peptide Biology, Salk Institute, La Jolla, California 92037.
Cell
|July 10, 1992
概括
在初始的cAMP诱导后,对cAMP响应的元素结合蛋白 (CREB) 被脱,从而降低了体静止素基因转录. 蛋白酸酶1 (PP-1) 解化CREB,作为其活动的关键调节者.
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
- 基因规则 基因规则
背景情况:
- 循环腺单酸盐 (cAMP) 信号通路调节基因转录.
- 响应cAMP的元素结合蛋白 (CREB) 是cAMP激活的关键转录因子.
- 了解CREB调节对于破译细胞对各种刺激的反应至关重要.
研究的目的:
- 阐明cAMP-响应元素结合蛋白 (CREB) 转录活性衰减的机制.
- 为了确定负责CREB脱化的特定酸酶.
- 研究这种酸酶在调节cAMP依赖基因表达中的作用.
主要方法:
- 代谢标记研究以追踪蛋白质酸化和脱酸化.
- 用酸酶抑制剂治疗 (抑制剂1蛋白,酸).
- 在PC12细胞中分析CREB酸化在Ser-133和体静止素基因转录.
主要成果:
- 在cAMP诱导后,CREB经历过短暂酸化,随后进行脱酸化.
- 在Ser-133中对CREB的脱化与减少的体静止素基因转录有关.
- 酸酶抑制剂阻止了CREB脱化,并增强了转录反应.
- 蛋白酸酶1 (PP-1) 被确定为可能负责CREB脱酸化的酸酶.
结论:
- 蛋白酸酶1 (PP-1) 在对cAMP敏感细胞的CREB活性调节中起着重要作用.
- PP-1 特别在Ser-133 中去化CREB,从而抑制cAMP依赖的转录.
- 这一发现为控制CREB介导基因表达的负反机制提供了关键的见解.
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