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Molecular Biology and Physiology:阐明一种小分子抑制 “超级细菌” 机理

2020-03-27 中国科学报 中国科学报

近年来由于抗生素滥用,出现了一类对所有的β—内酰胺类药物(包括临床最常用的青霉素与头孢菌素)都具有耐药性的 “超级细菌”。

近年来由于抗生素滥用,出现了一类对所有的β—内酰胺类药物(包括临床最常用的青霉素与头孢菌素)都具有耐药性的 “超级细菌”——耐甲氧西林金黄色葡萄球菌(MRSA)。应用抑制剂 Targocil 目前被认为是对抗这种超级细菌的有效方案。中国科学技术大学教授陈宇星、周丛照和孙林峰课题组合作阐明了 Targocil 抑制这种超级细菌的机理。该研究成果近日发表于《微生物学》

研究表明,MRSA 的细胞壁主要成分胞壁酸是引起耐药性的关键因素之一。胞壁酸在细菌分裂、生物膜形成、宿主定殖等过程中起着重要作用。胞壁酸合成路径中的翻转酶是新型抗菌药物的重要靶点。作为最具潜力的抗生素靶标之一,翻转酶及其抑制剂成为重点研究对象。先导化合物小分子 Targocil 近期被鉴定出对这种翻转酶具有较好的抑制效力,但是其抑制的分子机制尚未明了。

研究团队运用冷冻电镜方法,解析了翻转酶转运胞壁酸的机理以及 Targocil 的抑制机制,并进一步通过生化实验和计算机模拟确定了 Targocil 结合翻转酶的精确位点,进一步验证了其抑制翻转酶转运胞壁酸的分子机制。研究结果将为设计和优化针对耐甲氧西林金黄色葡萄球菌的新型抗生素提供结构基础和理论指导。

原始出处:

Li Chen, Wen-Tao Hou, Tao Fan, et al.  Cryo-electron Microscopy Structure and Transport Mechanism of a Wall Teichoic Acid ABC Transporter. Molecular Biology and Physiology, 2020.

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    2020-11-21 sunylz
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    2020-11-14 宋威
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