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在MmpL5-AcpM复合体中Mycobacterium smegmatis的冷-EM结构

Rakesh Maharjan¹, Zhemin Zhang¹, Philip A Klenotic¹

¹Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.

|October 31, 2024

概括

研究人员发现了Mycobacterium smegmatis MmpL5的第一个结构,这是一种对铁吸收至关重要的内膜载体. 这一发现揭示了MmpL5如何与AcpM相互作用,为新的结核病药物设计策略铺平了道路.

科学领域:

结构生物学是结构生物学.
微生物学微生物学
药物发现药物发现

背景情况:

由*Mycobacterium tuberculosis*引起的结核病 (TB) 是一个全球性的健康挑战,由多药性耐药性加剧.
菌膜蛋白大 (MmpL) 载体是菌膜蛋白生存的关键,是有吸引力的药物标.
已知MmpL3的结构,但缺乏其他MmpL子类的结构信息,例如MmpL5参与铁稳定.

研究的目的:

确定 *Mycobacterium smegmatis* MmpL5 载体的第一个结构.
为了阐明MmpL5与美罗糖延伸载体蛋白M (AcpM) 之间的相互作用.
提出一个机制,用于铁的获取和mycobactin转移在mycobacteria.

主要方法:

使用冷电子显微镜 (cryo-EM) 确定与AcpM结合的MmpL5的结构.
该结构的分辨率为2.81 Å.
生物信息分析和结构比较被用来提出功能相互作用.

主要成果:

获得了第一个与AcpM复合的*Mycobacterium smegmatis* MmpL5的冷EM结构.
结构显示MmpL5和AcpM在细胞质内相互作用,形成一个复合体.
为了获得铁,建议在MmpL5和mycobactin L (MbtL) 之间形成潜在的异构复合体.

结论:

MmpL5-AcpM结构为菌体的铁运输机制提供了关键的见解.
这些发现表明,mycobactin转位的新途径对于mycobacterial生存至关重要.
这些结构信息将指导开发新的结构导向药物来对抗结核病.

关键词:

在MmpL5中,MmpL5是MmpL5.菌根细菌膜蛋白大型大型乙烯基载体蛋白M是一种M类蛋白.铁的收购铁的收购菌根素 L L L 菌根素 L 在 siderophore 出口出口.

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