5V5S image
Entry Detail
PDB ID:
5V5S
EMDB ID:
Title:
multi-drug efflux; membrane transport; RND superfamily; Drug resistance
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-03-15
Release Date:
2017-04-19
Method Details:
Experimental Method:
Resolution:
6.50 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Outer membrane protein TolC
Chain IDs:A, B, C
Chain Length:442
Number of Molecules:3
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:Multidrug efflux pump subunit AcrA
Chain IDs:D, E, F, G, H, I
Chain Length:397
Number of Molecules:6
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:Multidrug efflux pump subunit AcrB
Chain IDs:J, K, L
Chain Length:1049
Number of Molecules:3
Biological Source:Escherichia coli
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
An allosteric transport mechanism for the AcrAB-TolC Multidrug Efflux Pump.
Elife 6 ? ? (2017)
PMID: 28355133 DOI: 10.7554/eLife.24905

Abstact

Bacterial efflux pumps confer multidrug resistance by transporting diverse antibiotics from the cell. In Gram-negative bacteria, some of these pumps form multi-protein assemblies that span the cell envelope. Here, we report the near-atomic resolution cryoEM structures of the Escherichia coli AcrAB-TolC multidrug efflux pump in resting and drug transport states, revealing a quaternary structural switch that allosterically couples and synchronizes initial ligand binding with channel opening. Within the transport-activated state, the channel remains open even though the pump cycles through three distinct conformations. Collectively, our data provide a dynamic mechanism for the assembly and operation of the AcrAB-TolC pump.

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Primary Citation of related structures