Perturbed structural dynamics underlie inhibition and altered specificity of the multidrug efflux pump AcrB
Perturbed structural dynamics underlie inhibition and altered specificity of the multidrug efflux pump AcrB
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结构动力学的扰动是多药外排泵 AcrB 抑制和特异性改变的基础
DOI:
10.1101/2020.04.27.063511
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Reading E
中科院分区:
文献类型:
--
作者:
Reading E
Resistance-nodulation-division (RND) efflux pumps play a key role in inherent and evolved multidrug-resistance (MDR) in bacteria. AcrB is the prototypical member of the RND family and acts to recognise and export a wide range of chemically distinct molecules out of bacteria, conferring resistance to a variety of antibiotics. Although high resolution structures exist for AcrB, its conformational fluctuations and their putative role in function are largely unknown, preventing a complete mechanistic understanding of efflux and inhibition. Here, we determine these structural dynamics in the presence of AcrB substrates using hydrogen/deuterium exchange mass spectrometry, complemented by molecular modelling, drug binding and bacterial susceptibility studies. We show that the well-studied efflux pump inhibitor phenylalanine-arginine-β-naphthylamide (PAβN) potentiates antibiotic activity by restraining drug-binding pocket dynamics, rather than preventing antibiotic binding. We also reveal that a drug-binding pocket substitution discovered within an MDR clinical isolate, AcrBG288D, modifies the plasticity of the transport pathway, which could explain its altered substrate specificity. Our results provide molecular insight into drug export and inhibition of a major MDR-conferring efflux pump and the important directive role of its dynamics.
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DOI:
10.1073/pnas.1602472113
发表时间:
2016-03-29
影响因子:
11.1
作者:
Sjuts, Hanno;Vargiu, Attilio V.;Opperman, Timothy J.
通讯作者:
Opperman, Timothy J.
影响因子:
16.6
作者:
通讯作者:
--
影响因子:
3
作者:
Trott, Oleg;Olson, Arthur J.
通讯作者:
Olson, Arthur J.
DOI:
--
发表时间:
2021
期刊:
Field Guide to Optical Biosensing
影响因子:
--
作者:
R. Martín
通讯作者:
R. Martín
影响因子:
--
作者:
Reading E;Walton TA;Liko I;Marty MT;Laganowsky A;Rees DC;Robinson CV
通讯作者:
Robinson CV