A "Drug Sweeping" State of the TriABC Triclosan Efflux Pump from Pseudomonas aeruginosa.

A "Drug Sweeping" State of the TriABC Triclosan Efflux Pump from Pseudomonas aeruginosa.
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铜绿假单胞菌 TriABC 三氯生排出泵的 "药物清扫 "状态。

DOI:
10.1016/j.str.2020.09.001
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发表时间:
2021-03-04
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Sygusch J
Sygusch J
中科院分区:
其他
文献类型:
--
作者:
Fabre L;Ntreh AT;Yazidi A;Leus IV;Weeks JW;Bhattacharyya S;Ruickoldt J;Rouiller I;Zgurskaya HI;Sygusch J

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通过冷冻电子显微镜(分辨率为4.5 μ m)测定了铜绿假单胞菌三氯生/SDS特异性外排泵的TriABC内膜组件的结构。解决了抗性-结瘤-分裂(RND)超家族的内膜转运蛋白TriC的完整结构,包括融合的周质膜融合亚基TriA和TriB的部分结构。TriABC的无底物构象代表了外膜通道接合之前外排复合物组装的中间步骤。结构分析确定了一个隧道网络,其收缩阻碍底物外排,表明在未参与状态下抑制TriABC。盲对接研究揭示了底物和体积较大的非底物在相同位点与TriC的结合。与功能分析一起,我们提出,选择性底物易位涉及构象门控在隧道变窄,与TriA和TriB的构象排序一起创建一个参与的状态能够介导底物外排。TriABC是一种来自铜绿假单胞菌的三氯生/SDS特异性外排泵,与杀菌剂耐药性有关。亚基TriA和TriB在没有底物的情况下显示出无序。外排涉及TriC亚基中的隧道,由功能和对接数据支持。通道狭窄的内部门控环位于后瓦尔698抑制流出。
The structure of the TriABC inner membrane component of the triclosan/SDS-specific efflux pump from Pseudomonas aeruginosa was determined by cryo-electron microscopy to 4.5Å resolution. The complete structure of the inner membrane transporter TriC of the Resistance-Nodulation-Division (RND) superfamily was solved including a partial structure of the fused periplasmic membrane fusion subunits, TriA and TriB. The substrate-free conformation of TriABC represents an intermediate step in efflux complex assembly prior to the engagement of the outer membrane channel. Structural analysis identified a tunnel network whose constriction impedes substrate efflux, indicating inhibition of TriABC in the unengaged state. Blind docking studies revealed binding to TriC at the same loci by substrates and bulkier non-substrates. Together with functional analyses, we propose that selective substrate translocation involves conformational gating at the tunnel narrowing that together with conformational ordering of TriA and TriB creates an engaged state capable of mediating substrate efflux. TriABC is a triclosan/SDS-specific efflux pump from Pseudomonas aeruginosa and linked to biocide resistance. Subunits TriA and TriB show disorder in absence of substrate. Efflux implicates a tunnel in TriC subunits, supported by functional and docking data. Tunnel narrowing by an internal gating loop situated after Val 698 inhibits efflux.
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