Antibiotic export by MexB multidrug efflux transporter is allosterically controlled by a MexA-OprM chaperone-like complex.

Antibiotic export by MexB multidrug efflux transporter is allosterically controlled by a MexA-OprM chaperone-like complex.
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MexB多药外排转运体的抗生素输出受MexA-OprM类伴侣复合体的变构控制。

DOI:
10.1038/s41467-020-18770-5
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发表时间:
2020-10-02
影响因子:
16.6
通讯作者:
Lambert O
Lambert O
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Glavier M;Puvanendran D;Salvador D;Decossas M;Phan G;Garnier C;Frezza E;Cece Q;Schoehn G;Picard M;Taveau JC;Daury L;Broutin I;Lambert O

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三方多药外排系统MexAB-OprM是铜绿假单胞菌抗生素耐药性的主要参与者,通过输出各种各样的抗菌化合物。MexB及其大肠杆菌同源物AcrB的晶体结构揭示了通过构象相互转换(从松散和紧密结合口袋到药物出口的打开门(LTO))描绘定向药物途径的不对称三聚体。目前尚不清楚MexB如何获得其LTO形式。在这里,通过在组装过程的各个阶段对MexB进行功能和cryo-EM结构研究,我们揭示了插入脂质膜中的MexB不适合主动转运,因为它显示出具有关闭出口门的非活性LTC形式。在三重复合体中,OprM和MexA形成了一个类似紧身胸衣的平台,将MexB转化为活性形式。我们的研究结果揭示了新的光的阻力,促进细胞分裂(RND)同源伙伴,作为变构因子引起的功能药物挤出。三方多药外排系统MexAB-OprM是铜绿假单胞菌抗生素耐药性的主要参与者,通过输出各种各样的抗菌化合物。在这里,作者介绍了MexB在组装过程的各个阶段的冷冻电镜结构,并提供了MexB激活由OprM和MexA介导的证据。
The tripartite multidrug efflux system MexAB-OprM is a major actor in Pseudomonas aeruginosa antibiotic resistance by exporting a large variety of antimicrobial compounds. Crystal structures of MexB and of its Escherichia coli homolog AcrB had revealed asymmetric trimers depicting a directional drug pathway by a conformational interconversion (from Loose and Tight binding pockets to Open gate (LTO) for drug exit). It remains unclear how MexB acquires its LTO form. Here by performing functional and cryo-EM structural investigations of MexB at various stages of the assembly process, we unveil that MexB inserted in lipid membrane is not set for active transport because it displays an inactive LTC form with a Closed exit gate. In the tripartite complex, OprM and MexA form a corset-like platform that converts MexB into the active form. Our findings shed new light on the resistance nodulation cell division (RND) cognate partners which act as allosteric factors eliciting the functional drug extrusion. The tripartite multidrug efflux system MexAB-OprM is a major actor in Pseudomonas aeruginosa antibiotic resistance by exporting a large variety of antimicrobial compounds. Here authors present cryo-EM structures of MexB at various stages of the assembly process and provide evidence that MexB activation is mediated by OprM and MexA.
电子计数和束诱导运动校正可实现近原子分辨率的单粒子冷冻电镜。
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