6TA5

OprM-MexA complex from the MexAB-OprM Pseudomonas aeruginosa whole assembly reconstituted in nanodiscs


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Antibiotic export by MexB multidrug efflux transporter is allosterically controlled by a MexA-OprM chaperone-like complex.

Glavier, M.Puvanendran, D.Salvador, D.Decossas, M.Phan, G.Garnier, C.Frezza, E.Cece, Q.Schoehn, G.Picard, M.Taveau, J.C.Daury, L.Broutin, I.Lambert, O.

(2020) Nat Commun 11: 4948-4948

  • DOI: 10.1038/s41467-020-18770-5
  • Primary Citation of Related Structures:  
    6T7S, 6TA5, 6TA6

  • PubMed Abstract: 
  • The tripartite multidrug efflux system MexAB-OprM is a major actor in Pseudomonas aeruginosa antibiotic resistance by exporting a large variety of antimicrobial compounds. Crystal structures of MexB and of its Escherichia coli homolog AcrB had revealed asymmetric trimers depicting a directional drug pathway by a conformational interconversion (from Loose and Tight binding pockets to Open gate (LTO) for drug exit) ...

    The tripartite multidrug efflux system MexAB-OprM is a major actor in Pseudomonas aeruginosa antibiotic resistance by exporting a large variety of antimicrobial compounds. Crystal structures of MexB and of its Escherichia coli homolog AcrB had revealed asymmetric trimers depicting a directional drug pathway by a conformational interconversion (from Loose and Tight binding pockets to Open gate (LTO) for drug exit). It remains unclear how MexB acquires its LTO form. Here by performing functional and cryo-EM structural investigations of MexB at various stages of the assembly process, we unveil that MexB inserted in lipid membrane is not set for active transport because it displays an inactive LTC form with a Closed exit gate. In the tripartite complex, OprM and MexA form a corset-like platform that converts MexB into the active form. Our findings shed new light on the resistance nodulation cell division (RND) cognate partners which act as allosteric factors eliciting the functional drug extrusion.


    Organizational Affiliation

    CNRS, CBMN UMR5248, F-33600, Pessac, France. o.lambert@cbmn.u-bordeaux.fr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein OprMA, B, C474Pseudomonas aeruginosaMutation(s): 0 
Gene Names: oprMoprKPA0427
Membrane Entity: Yes 
UniProt
Find proteins for Q51487 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q51487 
Go to UniProtKB:  Q51487
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MexA family multidrug efflux RND transporter periplasmic adaptor subunitD, E, F, G, H, I366Pseudomonas aeruginosaMutation(s): 0 
Gene Names: 
Membrane Entity: Yes 
UniProt
Find proteins for P52477 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P52477 
Go to UniProtKB:  P52477
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Efflux pump membrane transporterJ, K, L1052Pseudomonas aeruginosaMutation(s): 0 
Gene Names: mexBmexB_1C0044_03030DZ934_11475E4V10_16065IPC3_09885IPC669_14600PAERUG_E15_London_28_01_14_02845PAMH19_0483RW109_RW109_01030
Membrane Entity: Yes 
UniProt
Find proteins for P52002 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P52002 
Go to UniProtKB:  P52002
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
French National Research AgencyFranceANR-17-CE11-0028-02

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-16
    Type: Initial release
  • Version 1.1: 2020-10-14
    Changes: Database references