在WhiB-Like转录因子中的芳香补丁促进了Mycobacterium结核病中的初级西格玛因子相互作用
bioRxiv : the preprint server for biology
|June 12, 2025
概括
类似WhiB的蛋白质通过通过保存的芳香斑块与西格玛因子A4相互作用来调节Actinobacteria中的基因表达. 这一发现澄清了它们的功能和细菌和菌体之间的进化联系.
科学领域:
- 分子生物学分子生物学
- 微生物学 微生物学
- 结构生物学 结构生物学
背景情况:
- 类似WhiB (Wbl) 的蛋白质是具有铁硫的转录因子,是Actinobacteria和Actinobacteriophages特有的转录因子.
- Wbl蛋白对细胞发育,氧化还原应激反应和抗生素耐药性至关重要.
- 由于缺乏正规的DNA结合动机,Wbl介导的基因调节机制尚不清楚.
研究的目的:
- 阐明Wbl家族蛋白调节基因表达的机制.
- 为了确定Wbl蛋白和西格玛因子之间的分子接口.
- 为了研究这种交互界面的进化保存.
主要方法:
- 来自Mycobacterium tuberculosis的Wbl蛋白质的结构,分子和生物化学分析.
- 调查Wbl与主要西格玛因子 (σA4) 的保存区域4的相互作用.
- 代表Wbl家族蛋白质的生物信息分析和结构建模.
主要成果:
- 所有的Mtb Wbls都通过铁硫结合口袋中的一个保存的芳香补丁在同一地点与sA4结合.
- 这种相互作用主要由疏水性相互作用主导.
- 芳香斑块是Wbl家族中保存的结构图案.
结论:
- Wbl 蛋白通过与 σA4.4 的共享交互接口来调节基因表达.
- 这项研究揭示了Wbl介导的转录调节的保存机制.
- 这些发现揭示了actinobacteria中的Wbls及其菌体之间的进化关系.
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