无序的CREB交换活化域的富含谷氨酸的区域介导动态的分子内和分子间相互作用
Maria A Martinez-Yamout1, Irem Nasir1, Sergey Shnitkind1
1Department of Integrative Structural and Computational Biology and Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037.
概括
循环AMP反应元件 (CRE) 结合蛋白 (CREB) 交换活化域本质上是无序的,具有动态相互作用. 酸化扩大了酶诱导激活域 (KID),增强了同活性剂的结合.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- CREB 是一个关键的转录因子,调节基因表达.
- 它的N终端交易激活域 (CREBTAD) 包括Q1,Q2和KID子域.
- 这些子域本质上是无序的,倾向于二次结构.
研究的目的:
- 调查CREB交易激活域 (CREBTAD) 中的结构动态和相互作用.
- 阐明富含谷氨胺的域 (Q1,Q2) 在调解分子内和分子间相互作用中的作用.
- 了解酸化如何影响CREBTAD结构和联合激活剂结合.
主要方法:
- 核磁共振 (NMR) 光谱学是指核磁共振 (NMR) 的光谱学.
- 微角X射线散射 (SAXS) 是一种微角X射线散射技术.
- 单分子福斯特共振能量转移 (smFRET) 技术
- 偏磁性放松增强剂 (PRE) 是一种
主要成果:
- CREBTAD仍然是动态无序的,在Q1和Q2内短暂的远程接触.
- 该KID域显示一些紧缩,和酸化诱导其扩张.
- Q1/Q2中的富含谷氨胺的图案与TAF4和潜在的其他合作伙伴之间的相互作用.
结论:
- 在CREB的交易激活领域表现出复杂的,动态的障碍与短暂的相互作用.
- 酸化诱导的KID扩张可能有助于转录辅激剂的招募.
- 这些发现为CREB介导的转录调节提供了分子洞察力.
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