通过UrtR对尿酸的反应进行转录调节的结构基础
Wan Seok Song1, Dong Uk Ki2, Hye Yeon Cho2
1Institute of Bioscience and Biotechnology, Kangwon National University, 1 Kangwondaehakgil, Chuncheon 24341, Republic of Korea.
Nucleic acids research
|November 1, 2024
概括
尿酸敏感转录调节器 (UrtRs) 协调细菌的毒性和新陈代谢. UA与UrtRs结合会导致局部结构变化,防止DNA相互作用,这是MarR超级家族中的一种新机制.
科学领域:
- 细菌转录的调节 细菌转录的调节
- 基因表达的分子机制
- 蛋白质-DNA相互作用
背景情况:
- 尿酸敏感转录调节器 (UrtRs) 是细菌毒性和代谢的关键参与者.
- UrtRs属于多重抗生素耐药性调节器 (MarR) 超级家族.
- 了解UrtR的功能需要详细的结构和机制见解.
研究的目的:
- 阐明UrtRs.的转录性调节机制.
- 在各种状态 (单独,与UA,与DNA) 中结构分析UrtR蛋白 (PecS,MftR,HucR).
- 将UrtR的监管机制与其他MarR超级家族成员进行比较.
主要方法:
- 使用X射线结晶学或类似技术对UrtR蛋白的结构分析.
- 生物化学试验用于在尿酸存在或不存在的情况下研究蛋白质-DNA结合.
- 对UrtR结构与其他MarR家族蛋白质进行比较分析.
主要成果:
- UrtRs通过二元化域形成同质体,并具有独特的N端α螺旋体,参与二元化和UA结合.
- 在没有UA的情况下,UrtR通过特定的域绑定dSDNA.
- UA结合诱导了UrtRs的局部构造变化,通过与其他MarR成员不同的全oster机制破坏了DNA结合.
结论:
- UrtRs使用独特的N端螺旋来进行二元化和UA传感.
- UA结合触发了UrtRs中的局部全形状变化,抑制了DNA结合.
- 这种机制与在其他MarR超级家族调节者中观察到的全球形状变化有显著差异.
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