期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
卷 1863, 期 1, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.bbamem.2020.183488
关键词
Tripartite multidrug efflux pump; Membrane transport; Drug efflux; Electron microscopy; Major facilitator superfamily; EmrAB-TolC
资金
- University of Bordeaux-IdeX international program
- German Research Foundation [DFG-SFB 807]
This study investigates the structure and function of the Gram-negative bacteria efflux system, revealing the collaboration of inner membrane transporter, outer membrane channel, and periplasmic adaptor protein in the EmrAB-TolC tripartite system. Through electron microscopy, a 33 nm long complex stabilized by Amphipol belt was observed, suggesting a potential tip-to-tip interaction between EmrA and TolC.
Gram-negative bacteria export a large variety of antimicrobial compounds by forming two-membrane spanning tripartite multidrug efflux systems composed of an inner membrane transporter, an outer membrane channel and a periplasmic adaptor protein. Here we present the co-expression, purification and first electron microscopy insights of the Escherichia coli EmrAB-TolC tripartite Major Facilitator Superfamily (MSF) efflux system as a whole complex stabilized by Amphipol polymer. The structure reveals a 33 nm long complex delineated by the Amphipol belt at both extremities. Comparison of projection structures of EmrAB-TolC and AcrAB-TolC indicates that the outer membrane protein TolC linked to the periplasmic adaptor EmrA protein form an extended periplasmic canal. The overall length of EmrAB-TolC complex is similar to that of AcrAB-TolC with a probable tip-to-tip interaction between EmrA and TolC unveiling how the adaptor protein connects TolC and EmrB embedded in the inner membrane.
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