来自Streptococcus pyogenes的酸盐 siderophore 结合蛋白 FtsB 的连接物杂交的结构基础
Jorge Fernandez-Perez1, Akinobu Senoo2, Jose M M Caaveiro3
1Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Structure (London, England : 1993)
|October 12, 2024
概括
杆菌pyogenes利用一种铁吸收系统 (FtsABCD) 惊人地结合了多个外部 siderophores,而不仅仅是它可以生产的. 这种广泛的识别机制使病原体能够从各种微生物来源获得必要的铁.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 病变的发生和发病.
背景情况:
- 病原性细菌需要铁来生长,使得铁吸收系统成为抗微生物药物的关键目标.
- 菌 pyogenes 拥有 FtsABCD 铁运输系统,主要与胺酸 siderophores 相关.
- 这个系统的作用尚不清楚,因为S. pyogenes不能合成这些 siderophores.
研究的目的:
- 为了研究Streptococcus pyogenes中FtsB蛋白的基质特异性.
- 了解S. pyogenes如何通过其FtsABCD系统获得铁,尽管缺乏内源性 siderophore 生产.
主要方法:
- 生物化学测试以确定FtsB与各种 siderophores 的结合亲和力.
- 对FtsB结合口袋的结构分析,以阐明连接体识别机制.
主要成果:
- 除了铁,FtsB还表现出高亲和度 (纳米) 结合多个异光体,包括铁氧胺E,铁氧胺B和比苏卡贝林.
- 结构洞察力表明,FtsB结合口袋中的芳香残留物通过CH-π相互作用促进与各种 siderophore 结构的相互作用.
- 这解释了FtsB与各种外部 siderophores 的乱交结合.
结论:
- 杆菌pyogenes可以利用一系列外部来源的 siderophores 通过FtsABCD系统获得铁.
- FtsB结合口袋的杂乱性是S. pyogenes从各种微生物环境中收集铁的能力的关键.
- 这突显了病原体治疗干预的铁获取策略中的潜在漏洞.
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