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 1.1 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: 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 ...

    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

    Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1GA, U.K.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein TolCA, B, C479Escherichia 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
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Macrolide export protein MacAD, E, F, G, H, I371Escherichia 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
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Macrolide export ATP-binding/permease protein MacBJ, K654Escherichia coli K-12Mutation(s): 0 
Gene Names: macBybjZb0879JW0863
EC: 3.6.3 (PDB Primary Data), 7.6.2 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for P75831 (Escherichia coli (strain K12))
Explore P75831 
Go to UniProtKB:  P75831
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

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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