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Nat Commun:中国科大发现新型革兰氏阳性菌药物外排泵

2018-01-30 佚名 中科大

中国科学技术大学合肥微尺度物质科学国家研究中心和生命科学学院教授周丛照、陈宇星课题组,解析了肺炎链球菌中一种新型ABC转运蛋白(Spr0693和Spr0694-0695)的原子分辨率结构,揭示了革兰氏阳性菌抗药的一种新机制。相关研究成果以Structure of a MacAB-like efflux pump from Streptococcus pneumoniae为题,发表在《自然-通讯》上

中国科学技术大学合肥微尺度物质科学国家研究中心和生命科学学院教授周丛照、陈宇星课题组,解析了肺炎链球菌中一种新型ABC转运蛋白(Spr0693和Spr0694-0695)的原子分辨率结构,揭示了革兰氏阳性菌抗药的一种新机制。相关研究成果以Structure of a MacAB-like efflux pump from Streptococcus pneumoniae为题,发表在《自然-通讯》上。

药物外排泵是细菌抵御外界有毒物质的主要方式,而ABC转运蛋白是药物外排泵中的一种重要类型,它依靠ATP水解的能量将这些有毒物质排出。在大肠杆菌等革兰氏阴性菌中已发现一种ABC类型的药物外排泵MacAB-TolC,可将抗生素从胞内依次跨过内膜、周质腔、外膜转运到细菌外。但类似系统是否存在于革兰氏阳性菌中尚不清楚。

周丛照、陈宇星课题组利用X-射线晶体学手段,解析肺炎链球菌中ABC转运蛋白Spr0694-0695和Spr0693的三维结构,是第一个革兰氏阳性菌中MacAB-like的药物外排泵。Spr0694-0695位于细胞膜上,不同于经典的ABC转运蛋白,它具有8次跨膜螺旋以及一个较大的胞外结构域;而Spr0693六聚体形成纳米管状结构,连接Spr0695与细胞壁。整合结构生物学、生物化学和微生物遗传学实验方法,鉴定了一条从Spr0695到Spr0693的底物转运通道,并发现Spr0695的跨膜区与胞外区之间的一个alpha螺旋控制了该通道的开关,转运过程所需能量由Spr0694水解ATP提供。该工作发现了一类全新的革兰氏阳性菌ABC转运蛋白的组织形式,并阐明了药物外排的分子机理,为抗生素的设计和改造提供了结构基础。

研究工作得到科技部、国家自然科学基金委、中科院战略性先导科技专项和教育部中央高校基本科研业务费的资助。

原始出处:

Hong-Bo Yang,et al.Structure of a MacAB-like efflux pump from Streptococcus pneumoniae.Nat Commun.15 January 2018

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    2018-08-07 jml2009
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    2018-07-19 liye789132251
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    2018-06-05 whmdzju
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    2018-06-26 liuli5079
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    2018-02-06 1209e435m98(暂无昵称)

    学习了.谢谢分享

    0

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    2018-02-02 1dd8c52fm63(暂无匿称)

    学习学习.继续关注

    0

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    2018-01-31 飛歌

    学习了很有用

    0

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    2018-01-30 有备才能无患

    中国科学技术大学合肥微尺度物质科学国家研究中心和生命科学学院教授周丛照.陈宇星课题组.解析了肺炎链球菌中一种新型ABC转运蛋白(Spr0693和Spr0694-0695)的原子分辨率结构.揭示了革兰氏阳性菌抗药的一种新机制

    0

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