一种细菌的NO结合传感器领域通过获得细胞染色体衍生的c型血结合动机而演变
bioRxiv : the preprint server for biology
|February 12, 2026
概括
研究人员发现了一种新型的细菌Cache域家族,它们结合,扩展它们已知的功能超出了辅因子独立感应的范围. 这些含血的域对细菌信号和传感器进化至关重要.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 细菌的感觉领域,如Per-Arnt-Sim (PAS) 和Cache,将环境线索传递给信号通路.
- 缓存域以前被认为是完全独立于辅因子的,不像PAS域绑定辅因子的辅因子,如heme.
- DUF3365/Tll0287家族被注释为未知功能.
研究的目的:
- 识别和描述具有辅因子结合能力的新型缓存域.
- 调查结在缓存域中的heme结合的功能影响.
- 了解这些独特的传感器领域的进化起源.
主要方法:
- 系统的序列分析以确定保存的图案.
- 基于结构和序列的比较与已知的蛋白质域.
- 遗传学分析以推断进化关系.
- 频谱和带结合测试以确定辅因子相互作用和功能.
主要成果:
- 一个大型的Cache域家族 (DUF3365/Tll0287) 通过保留的CXXCH基因对c型血红蛋白进行共价结合.
- 这些域具有一个Cache折叠,并增加了一个heme-binding结构元素.
- 含有heme的缓存域广泛存在,特别是在Gracilicutes中,并且经常作为独立模块运行.
- 遗传学分析表明,一个独特的进化起源涉及碎片插入到一个Cache脚手架.
- 功能性测试表明,在与信号模块融合时的氧化传感和作为独立领域的氧化还原传感中发挥了作用.
结论:
- 缓存域拥有更广泛的功能目录,包括共价结合的辅因子.
- 碎片级的图案招募是细菌感官系统的一个重要的进化机制.
- 这一发现重新定义了对细菌传感器领域进化和功能的理解.
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