7JK8 image
Deposition Date 2020-07-27
Release Date 2020-12-09
Last Version Date 2024-05-01
Entry Detail
PDB ID:
7JK8
Title:
EmrE S64V mutant bound to tetra(4-fluorophenyl)phosphonium at pH 5.8
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Method Details:
Experimental Method:
Conformers Calculated:
160
Conformers Submitted:
10
Selection Criteria:
structures with the least restraint violations
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Multidrug SMR transporter
Mutations:S64V
Chain IDs:A, B
Chain Length:110
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Structure and dynamics of the drug-bound bacterial transporter EmrE in lipid bilayers.
Nat Commun 12 172 172 (2021)
PMID: 33420032 DOI: 10.1038/s41467-020-20468-7

Abstact

The dimeric transporter, EmrE, effluxes polyaromatic cationic drugs in a proton-coupled manner to confer multidrug resistance in bacteria. Although the protein is known to adopt an antiparallel asymmetric topology, its high-resolution drug-bound structure is so far unknown, limiting our understanding of the molecular basis of promiscuous transport. Here we report an experimental structure of drug-bound EmrE in phospholipid bilayers, determined using 19F and 1H solid-state NMR and a fluorinated substrate, tetra(4-fluorophenyl) phosphonium (F4-TPP+). The drug-binding site, constrained by 214 protein-substrate distances, is dominated by aromatic residues such as W63 and Y60, but is sufficiently spacious for the tetrahedral drug to reorient at physiological temperature. F4-TPP+ lies closer to the proton-binding residue E14 in subunit A than in subunit B, explaining the asymmetric protonation of the protein. The structure gives insight into the molecular mechanism of multidrug recognition by EmrE and establishes the basis for future design of substrate inhibitors to combat antibiotic resistance.

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Primary Citation of related structures