不同的D-ribulose利用途径在附着和消除病原体的趋同演变
Curtis Cottam1, Kieran Bowran1, Rhys T White2
1Newcastle University Biosciences Institute, Newcastle University, Newcastle-upon-Tyne, UK.
Nature communications
|July 29, 2025
概括
肠出血性大肠杆菌 (EHEC) 劫持糖代谢,在肠道中壮成长. 它使用辅助L-阿拉比诺斯吸收 (Aau) 输送器来利用D-利布洛斯,从而获得竞争优势.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 病原体与宿主之间的相互作用
背景情况:
- 附着和消除病原体竞争资源,克服殖民抵抗.
- 肠道出血性大肠杆菌 (EHEC) 使用辅助L-阿拉比诺斯吸收 (Aau) 载体进行肠道殖民,可能通过清理L-阿拉比诺斯.
- 在EHEC中Aau载体的特定体内益处仍然不清楚.
研究的目的:
- 阐明EHEC Aau输送器的体内功能和基质特异性.
- 了解EHEC如何在肠道环境中获得健身优势.
主要方法:
- 研究了Aau载体对D-ribulose和L-arabinose的基质亲和力.
- 评估了 D-ribulose 和 L-arabinose 在 EHEC 增长和 Aau 载体调节中的作用.
- 在EHEC内检查了D-ribulose的代谢命运.
主要成果:
- 该Aau输送器对D-ribulose的亲和力显著高 (超过200倍),而不是对L-arabinose的亲和力.
- 作为唯一的碳来源,EHEC不能代谢D-ribulose,也不能诱导Aau转录.
- 在L-氨酸存在时,Aau将D-氨酸运输到L-氨酸酶 (AraB) 路径中,通过L-氨酸酶 (AraB) 将其输送到酸路径中,从而赋予体能优势.
- 杆菌虫 (Citrobacter rodentium) 拥有类似的D-ribulose利用系统.
结论:
- EHEC已经开发出一种利用D-ribulose的机制,通过劫持L-arabinose利用途径来利用D-ribulose.
- 这种D-ribulose的利用在肠道殖民期间为EHEC提供了显著的健身优势.
- 融合进化导致不同的致病物种在肠道中利用D-ribulose.
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