6OWS

Cryo-EM structure of an Acinetobacter baumannii multidrug efflux pump


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.98 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Cryo-Electron Microscopy Structure of an Acinetobacter baumannii Multidrug Efflux Pump.

Su, C.C.Morgan, C.E.Kambakam, S.Rajavel, M.Scott, H.Huang, W.Emerson, C.C.Taylor, D.J.Stewart, P.L.Bonomo, R.A.Yu, E.W.

(2019) mBio 10

  • DOI: 10.1128/mBio.01295-19
  • Primary Citation of Related Structures:  
    6OWS

  • PubMed Abstract: 
  • Resistance-nodulation-cell division multidrug efflux pumps are membrane proteins that catalyze the export of drugs and toxic compounds out of bacterial cells. Within the hydrophobe-amphiphile subfamily, these multidrug-resistant proteins form trimeric efflux pumps ...

    Resistance-nodulation-cell division multidrug efflux pumps are membrane proteins that catalyze the export of drugs and toxic compounds out of bacterial cells. Within the hydrophobe-amphiphile subfamily, these multidrug-resistant proteins form trimeric efflux pumps. The drug efflux process is energized by the influx of protons. Here, we use single-particle cryo-electron microscopy to elucidate the structure of the Acinetobacter baumannii AdeB multidrug efflux pump embedded in lipidic nanodiscs to a resolution of 2.98 Å. We found that each AdeB molecule within the trimer preferentially takes the resting conformational state in the absence of substrates. We propose that proton influx and drug efflux are synchronized and coordinated within the transport cycle. IMPORTANCE Acinetobacter baumannii is a successful human pathogen which has emerged as one of the most problematic and highly antibiotic-resistant Gram-negative bacteria worldwide. Multidrug efflux is a major mechanism that A. baumannii uses to counteract the action of multiple classes of antibiotics, such as β-lactams, tetracyclines, fluoroquinolones, and aminoglycosides. Here, we report a cryo-electron microscopy (cryo-EM) structure of the prevalent A. baumannii AdeB multidrug efflux pump, which indicates a plausible pathway for multidrug extrusion. Overall, our data suggest a mechanism for energy coupling that powers up this membrane protein to export antibiotics from bacterial cells. Our studies will ultimately inform an era in structure-guided drug design to combat multidrug resistance in these Gram-negative pathogens.


    Organizational Affiliation

    Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA edward.w.yu@case.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Efflux pump membrane transporterA, B, C1035Acinetobacter baumanniiMutation(s): 0 
Gene Names: adeBacrB32_436CBI29_01998EA686_00900DLI69_13355GNY86_15955
Membrane Entity: Yes 
UniProt
Find proteins for Q2FD70 (Acinetobacter baumannii)
Explore Q2FD70 
Go to UniProtKB:  Q2FD70
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.98 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2019-05-10 
  • Released Date: 2019-06-19 
  • Deposition Author(s): Su, C.-C.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-19
    Type: Initial release
  • Version 1.1: 2019-07-17
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence, Other