The structural basis of promiscuity in small multidrug resistance transporters.

The structural basis of promiscuity in small multidrug resistance transporters.
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小型多药耐药转运蛋白滥交的结构基础。

DOI:
10.1038/s41467-020-19820-8
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发表时间:
2020-11-27
影响因子:
16.6
通讯作者:
Stockbridge RB
Stockbridge RB
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kermani AA;Macdonald CB;Burata OE;Ben Koff B;Koide A;Denbaum E;Koide S;Stockbridge RB

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通过提供对环境杀生物剂的广泛抗性,来自小多药耐药(SMR)家族的转运蛋白驱动多药耐药盒在细菌群体中的传播。需要对SMR转运蛋白的底物选择性有基本的了解,以确定有助于此过程的选择性压力的类型。使用固体支持膜电生理学,我们发现,混杂运输的疏水取代阳离子是SMR转运的一般特征。为了理解混杂的分子基础,我们解决了SMR转运体Gdx-Clo与底物复合的X射线晶体结构,最大分辨率为2.3 μ m。这些结构证实了家庭的极其罕见的双重拓扑结构,并揭示了两个螺旋之间的裂缝,提供住宿的膜中的疏水取代基的运输药物样阳离子。Gdx-Clo是来自小多药耐药(SMR)家族的细菌转运蛋白。在这里,作者使用固体支撑膜电生理学来表征Gdx-Clo的功能,并报告Gdx-Clo的晶体结构,其证实了双拓扑结构,并提供了对底物结合和转运机制的见解。
By providing broad resistance to environmental biocides, transporters from the small multidrug resistance (SMR) family drive the spread of multidrug resistance cassettes among bacterial populations. A fundamental understanding of substrate selectivity by SMR transporters is needed to identify the types of selective pressures that contribute to this process. Using solid-supported membrane electrophysiology, we find that promiscuous transport of hydrophobic substituted cations is a general feature of SMR transporters. To understand the molecular basis for promiscuity, we solved X-ray crystal structures of a SMR transporter Gdx-Clo in complex with substrates to a maximum resolution of 2.3 Å. These structures confirm the family’s extremely rare dual topology architecture and reveal a cleft between two helices that provides accommodation in the membrane for the hydrophobic substituents of transported drug-like cations. Gdx-Clo is a bacterial transporter from the small multidrug resistance (SMR) family. Here, the authors use solid supported membrane electrophysiology to characterize Gdx-Clo functionally and report crystal structures of Gdx-Clo which confirm the dual topology architecture and offer insight into substrate binding and transport mechanism.
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