5NIK

Structure of the MacAB-TolC ABC-type tripartite multidrug efflux pump


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the MacAB-TolC ABC-type tripartite multidrug efflux pump.

Fitzpatrick, A.W.P.Llabres, S.Neuberger, A.Blaza, J.N.Bai, X.C.Okada, U.Murakami, S.van Veen, H.W.Zachariae, U.Scheres, S.H.W.Luisi, B.F.Du, D.

(2017) Nat Microbiol 2: 17070-17070

  • DOI: https://doi.org/10.1038/nmicrobiol.2017.70
  • Primary Citation of Related Structures:  
    5NIK, 5NIL

  • PubMed Abstract: 

    The MacA-MacB-TolC assembly of Escherichia coli is a transmembrane machine that spans the cell envelope and actively extrudes substrates, including macrolide antibiotics and polypeptide virulence factors. These transport processes are energized by the ATPase MacB, a member of the ATP-binding cassette (ABC) superfamily. We present an electron cryo-microscopy structure of the ABC-type tripartite assembly at near-atomic resolution. A hexamer of the periplasmic protein MacA bridges between a TolC trimer in the outer membrane and a MacB dimer in the inner membrane, generating a quaternary structure with a central channel for substrate translocation. A gating ring found in MacA is proposed to act as a one-way valve in substrate transport. The MacB structure features an atypical transmembrane domain with a closely packed dimer interface and a periplasmic opening that is the likely portal for substrate entry from the periplasm, with subsequent displacement through an allosteric transport mechanism.


  • Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Avenue, Cambridge CB2 0QH, U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein TolC
A, B, C
479Escherichia coli K-12Mutation(s): 0 
Gene Names: tolCcolE1-imtcBmukArefItocweeAb3035JW5503
Membrane Entity: Yes 
UniProt
Find proteins for P02930 (Escherichia coli (strain K12))
Explore P02930 
Go to UniProtKB:  P02930
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02930
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Macrolide export protein MacA
D, E, F, G, H
D, E, F, G, H, I
371Escherichia coli K-12Mutation(s): 0 
Gene Names: macAybjYb0878JW0862
Membrane Entity: Yes 
UniProt
Find proteins for P75830 (Escherichia coli (strain K12))
Explore P75830 
Go to UniProtKB:  P75830
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP75830
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Macrolide export ATP-binding/permease protein MacB
J, K
654Escherichia coli K-12Mutation(s): 0 
Gene Names: macBybjZb0879JW0863
EC: 3.6.3
Membrane Entity: Yes 
UniProt
Find proteins for P75831 (Escherichia coli (strain K12))
Explore P75831 
Go to UniProtKB:  P75831
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP75831
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited KingdomRG61065
Human Frontier Science ProgramJapanRG68784

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-24
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Other
  • Version 1.2: 2024-05-15
    Changes: Data collection, Database references