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Structure of the AcrAB–TolC multidrug efflux pump

DOI: 10.1038/nature13205 DOI Help
PMID: 24747401 PMID Help

Authors: Dijun Du (Department of Biochemistry, University of Cambridge, Cambridge, U.K.) , Zhao Wang (Baylor College of Medicine) , Nathan R. James (Department of Biochemistry, University of Cambridge, Cambridge, U.K.) , Jarrod Voss (Department of Biochemistry, University of Cambridge, Cambridge, U.K.) , Ewa Klimont (Department of Biochemistry, University of Cambridge, Cambridge, U.K.) , Thelma Ohene-agyei (University of Cambridge) , Henrietta Venter (University of South Australia) , Wah Chiu (Baylor College of Medicine) , Ben Luisi (Department of Biochemistry, University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature , VOL 509 (7501) , PAGES 512 - 515

State: Published (Approved)
Published: May 2014
Diamond Proposal Number(s): 9537

Open Access Open Access

Abstract: The capacity of numerous bacterial species to tolerate antibiotics and other toxic compounds arises in part from the activity of energy-dependent transporters. In Gram-negative bacteria, many of these transporters form multicomponent ‘pumps’ that span both inner and outer membranes and are driven energetically by a primary or secondary transporter component1, 2, 3, 4, 5, 6, 7. A model system for such a pump is the acridine resistance complex of Escherichia coli1. This pump assembly comprises the outer-membrane channel TolC, the secondary transporter AcrB located in the inner membrane, and the periplasmic AcrA, which bridges these two integral membrane proteins. The AcrAB–TolC efflux pump is able to transport vectorially a diverse array of compounds with little chemical similarity, thus conferring resistance to a broad spectrum of antibiotics. Homologous complexes are found in many Gram-negative species, including in animal and plant pathogens. Crystal structures are available for the individual components of the pump2, 3, 4, 5, 6, 7 and have provided insights into substrate recognition, energy coupling and the transduction of conformational changes associated with the transport process. However, how the subunits are organized in the pump, their stoichiometry and the details of their interactions are not known. Here we present the pseudo-atomic structure of a complete multidrug efflux pump in complex with a modulatory protein partner8 from E. coli. The model defines the quaternary organization of the pump, identifies key domain interactions, and suggests a cooperative process for channel assembly and opening. These findings illuminate the basis for drug resistance in numerous pathogenic bacterial species.

Journal Keywords: Carrier; Cryoelectron; Crystallography; X-Ray; Drug; Bacterial; Escherichia; Lipoproteins; Membrane; Models; Molecular; Multidrug; Protein; Tertiary; Protein Subunits

Subject Areas: Biology and Bio-materials

Instruments: I24-Microfocus Macromolecular Crystallography