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
Yamaguchi A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zwama M;Yamasaki S;Nakashima R;Sakurai K;Nishino K;Yamaguchi A

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AcrB是大肠杆菌中主要的多药输出体。虽然已经确定了几种底物进入途径,但这些不同转运途径的特异性仍然不清楚。在这里,我们提供了来自AcrB三聚体中央空腔的底物通道(通道3)的证据,该通道直接连接到深口袋,而不是首先通过开关环和近端口袋。平面芳香族阳离子,如乙锭,优先于通道3,而不是通道1和2。通过通道3的外流通过靶向突变而增加,并且不与通过通道1和2输出的药物,如米诺环素和红霉素竞争。开关环突变体,从近端到深袋的通路受阻,只能输出利用通道3的药物。因此,多个入口的使用有助于识别和运输具有不同物理化学性质的多种药物。多药转运体具有多个药物结合位点。在这里,作者描述了一条特定于平面芳香阳离子在大肠杆菌多药物转运体AcrB中的运输路径。
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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