对大肠杆菌YqgF的晶体结构和生物化学分析揭示了其多种功能
Manoj Thakur1, Kshitiza M Dhyani2, Andrey Galkin3
1Sri Venkateswara College, University of Delhi, New Delhi 110021, India.
Journal of molecular biology
|May 21, 2025
概括
大肠杆菌YqgF蛋白通过优先结合和分裂分支DNA结构来修复DNA损伤. 它独特的,合的ATPase和内核酶活性使其与类似的蛋白质如RuvC区别开来.
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:
- 大肠杆菌yqgF基因产物对于细菌生长和抗菌素耐药性至关重要.
- 一种RuvC家族蛋白质YqgF参与DNA损伤修复,但其机制尚不清楚.
研究的目的:
- 通过结构和生化分析,阐明大肠杆菌YqgF (EcYqgF) 的作用机制.
主要方法:
- 研究了使用分支,单链 (ssDNA) 和双链DNA (dsDNA) 的DNA结合偏好.
- 对各种DNA结构的内核酶活性和DNA独立的ATPase活性进行了评估.
- 确定了EcYqgF的晶体结构,并使用AI进行ATP结合建模.
- 分析了位点定向突变,并确定了ATPase缺陷变体.
主要成果:
- 在ssDNA和dsDNA上,ecYqgF优先结合和分裂分支DNA结构.
- 显示Mg2+依赖的ATPase活性与DNA裂变相结合,与RuvC.不同.
- 基于结构和人工智能的建模揭示了对ATP结合和突变效应的洞察力.
- 鉴定出新的ATPase缺陷变体,具有改变的DNA结合,但没有裂变活性.
结论:
- EcYqgF具有独特的双重活性,将ATP水解与内核酶功能合起来,使其与RuvC.区别开来.
- 已识别的ATPase缺陷变体突出显示了YqgF内核酶的一个未被认可的特性.
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