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:
影响因子:
--
通讯作者:
Sygusch J
中科院分区:
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
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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