4LZ6 image
Entry Detail
PDB ID:
4LZ6
Title:
Structure of MATE multidrug transporter DinF-BH
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-07-31
Release Date:
2013-10-23
Method Details:
Experimental Method:
Resolution:
3.20 Å
R-Value Free:
0.31
R-Value Work:
0.29
R-Value Observed:
0.3
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:BH2163 protein
Chain IDs:A
Chain Length:446
Number of Molecules:1
Biological Source:Bacillus halodurans
Ligand Molecules
Primary Citation
Structural insights into H(+)-coupled multidrug extrusion by a MATE transporter
Nat.Struct.Mol.Biol. 20 1310 1317 (2013)
PMID: 24141706 DOI: 10.1038/nsmb.2687

Abstact

Multidrug and toxic compound extrusion (MATE) transporters contribute to multidrug resistance by coupling the efflux of drugs to the influx of Na(+) or H(+). Known structures of Na(+)-coupled, extracellular-facing MATE transporters from the NorM subfamily revealed 12 membrane-spanning segments related by a quasi-two-fold rotational symmetry and a multidrug-binding cavity situated near the membrane surface. Here we report the crystal structure of an H(+)-coupled MATE transporter from Bacillus halodurans and the DinF subfamily at 3.2-Å resolution, unveiling a surprisingly asymmetric arrangement of 12 transmembrane helices. We also identified a membrane-embedded substrate-binding chamber by combining crystallographic and biochemical analyses. Our studies further suggested a direct competition between H(+) and substrate during DinF-mediated transport and implied how a MATE transporter alternates between its extracellular- and intracellular-facing conformations to propel multidrug extrusion. Collectively, our results demonstrated heretofore-unrecognized mechanistic diversity among MATE transporters.

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