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转录因子AP-2通过两个不同的信号转导途径调解诱导:蛋白激酶C和cAMP
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093.
激活蛋白2 (AP-2) 激活了多个基因的转录,包括人类金属氨酸IIA (hMT-IIA). AP-2通过涉及蛋白激酶C和蛋白激酶A的独特信号通路调解基因激活.
科学领域:
- 分子生物学分子生物学
- 基因法规 基因法规
- 生物化学 生化学
背景情况:
- 人类金属氨酸IIA (hMT-IIA) 基因控制区域是基因调节的关键部位.
- 增强剂结合蛋白在调节基因转录中起着至关重要的作用.
- 了解影响hMT-IIA基因表达的因素对于细胞过程很重要.
研究的目的:
- 为了净化和表征激活蛋白2 (AP-2),一种增强剂结合蛋白.
- 研究AP-2在hMT-IIA基因的转录激活中的作用.
- 确定通过AP-2介导其效应的信号传导通路.
主要方法:
- 蛋白质净化和AP-2的表征.
- 使用混合促进剂进行体外转录试验.
- 分析AP-2结合各种基因的控制元素 (hMT-IIA,生长激素,c-myc,H-2Kb,SV40,牛乳头瘤病毒).
- 评估合成增强剂的活性,以应对细胞治疗 (醇,cAMP提升剂).
主要成果:
- 纯化AP-2激活了hMT-IIA上游序列的促进体中的转录.
- AP-2 识别并结合多个基因和病毒增强剂中的控制元素.
- 合成AP-2结合部位作为细胞类型特异的增强剂起作用,其活性由醇和cAMP调节.
- 通过AP-1介导的增强剂活性仅由醇引发.
结论:
- AP-2是一种50kd增强剂结合蛋白,可以激活hMT-IIA基因的转录.
- AP-2在对蛋白激酶C和蛋白激酶A信号通路的反应中调解转录激活.
- 通过整合来自不同细胞通路的信号,AP-2在基因调节中发挥着重要作用.
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