由雄激素受体结合的DNA结合变化的基础结构机制
Xiao Yin Lee1, Wout Van Eynde2, Christine Helsen1
1Molecular Endocrinology Laboratory, Department of Cellular and Molecular Medicine, Campus Gasthuisberg ON1 Herestraat 49 - box 901, Leuven 3000, Belgium.
The Journal of steroid biochemistry and molecular biology
|April 11, 2024
概括
雄激素受体 (AR) DNA结合域 (DBD) 在DNA上形成头对头的二极体,解释了突变如何影响AR功能和结合亲和力. 这种结构洞察力揭示了合作的DNA结合机制.
科学领域:
- 分子生物学分子生物学
- 结构生物学是结构生物学.
- 遗传学 遗传学 是一个
背景情况:
- 雄激素受体 (AR) 是一个关键的转录因子,调节基因表达.
- 抗激素与特定的DNA序列结合,称为雄激素反应元素 (ARE).
- 了解AR-DNA相互作用对于理解雌激素介导的过程和诸如雌激素不敏感等疾病至关重要.
研究的目的:
- 阐明人类ARDNA结合域 (DBD) 在自然AREs上的二元化结构的基础.
- 调查雄激素不敏感突变对AR结构,DNA结合和二元化的影响.
- 描述AR DBD与不同DNA基因的结合亲和力和合作结合机制.
主要方法:
- 在2.05 Å和2.25 Å的X射线晶体学以确定AR DBD-DNA复杂结构.
- 生物层干涉计 (BLI) 用于测量AR DBD与ARE的结合亲和力.
- 分子动力学 (MD) 模拟以验证结合亲和关系并分析相互作用.
主要成果:
- 报告的人类AR DBD与C3和MTV AREs结合的结构.
- 证明第一个DBD与正规的5'-AGAACA-3'动机的高亲和结合促进了第二个DBD的合作结合.
- 鉴定了AR DBD单体与正规和非正规六核酸的明显相互作用,受DNA占用和蛋白质-蛋白质相互作用的影响.
结论:
- 该研究提供了对AR DBD二分化和DNA识别的结构性见解.
- 研究结果解释了AR突变如何影响DNA结合和二元化,可能导致雄激素不敏感.
- 观察到的合作结合机制对AR介导的转录调节具有功能意义.
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