Multiple entry pathways within the efflux transporter AcrB contribute to multidrug recognition.
Multiple entry pathways within the efflux transporter AcrB contribute to multidrug recognition.
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DOI:
10.1038/s41467-017-02493-1
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发表时间:
2018-01-09
影响因子:
16.6
通讯作者:
Yamaguchi A
中科院分区:
文献类型:
--
作者:
Zwama M;Yamasaki S;Nakashima R;Sakurai K;Nishino K;Yamaguchi A
AcrB is the major multidrug exporter in Escherichia coli. Although several substrate-entrances have been identified, the specificity of these various transport paths remains unclear. Here we present evidence for a substrate channel (channel 3) from the central cavity of the AcrB trimer, which is connected directly to the deep pocket without first passing the switch-loop and the proximal pocket . Planar aromatic cations, such as ethidium, prefer channel 3 to channels 1 and 2. The efflux through channel 3 increases by targeted mutations and is not in competition with the export of drugs such as minocycline and erythromycin through channels 1 and 2. A switch-loop mutant, in which the pathway from the proximal to the deep pocket is hindered, can export only channel 3-utilizing drugs. The usage of multiple entrances thus contributes to the recognition and transport of a wide range of drugs with different physicochemical properties. Multidrug transporters possess several drug binding sites. Here the authors describe a transport path specific for planar aromatic cations in the E. coli multi-drug transporter AcrB.
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影响因子:
3.6
作者:
Husain F;Nikaido H
通讯作者:
Nikaido H
影响因子:
16.6
作者:
通讯作者:
--
影响因子:
3.2
作者:
Hearn, EM;Gray, MR;Foght, JM
通讯作者:
Foght, JM
DOI:
10.1073/pnas.120163297
发表时间:
2000-06-06
影响因子:
11.1
作者:
Datsenko, KA;Wanner, BL
通讯作者:
Wanner, BL
影响因子:
2.2
作者:
Nishino, Kunihiko;Senda, Yasuko;Yamaguchi, Akihito
通讯作者:
Yamaguchi, Akihito