由辅因子甲基化介导的转录开关
1Gene Expression Laboratory, Department of Biological Chemistry, University of California Davis Cancer Center/Basic Science, Sacramento, CA 95817, USA.
概括
像CREB结合蛋白 (CBP) /p300等蛋白质的受控甲基化作为一个分子开关. 这种辅助因子甲基化调节激素信号通路中的基因激活.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因规则 基因规则
背景情况:
- 转录辅因子CREB结合蛋白 (CBP) /p300在基因激活中起着至关重要的作用.
- 这些共因子具有KIX域,对于招募CREB等转录因子至关重要.
- 转化后的修改,如甲基化,越来越被认为是关键的调节机制.
研究的目的:
- 研究甲基化在调节CBP/p300的功能中的作用.
- 阐明协活性剂相关的氨酸甲基转移酶1 (CARM1) 影响CREB激活的机制.
- 将辅因子甲基化定义为激素信号传递中的新型调节机制.
主要方法:
- 进行了体内和体外实验.
- 用于确定CBP/p300上的甲基化位点的方法是局部定向的突变发生.
- 进行了测试,以评估CBP/p300和CREB之间的相互作用,以及CARM1-介导甲基化的影响.
主要成果:
- 在CBP/p300的KIX域上,特定的氨酸残留物被确定为甲基化位点.
- 通过CARM1对该位点的甲基化抑制了CREB的KIX域和激酶可诱导域 (KID) 之间的相互作用.
- 在循环腺单酸盐 (cAMP) 信号传递中,CARM1的功能是抑制剂,但作为核激素信号传递的激活剂.
结论:
- 辅因子甲基化,特别是由CARM1,作为控制基因转录的分子开关.
- 希斯甲基化在激素诱导的基因激活中起着重要作用.
- 辅因子甲基化代表了激素信号通路内的新发现的调节机制.
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