7KF6

Cryo-electron microscopy structure of the heavy metal efflux pump CusA in a homogeneous binding copper(1) state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 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

Cryo-EM Structures of CusA Reveal a Mechanism of Metal-Ion Export.

Moseng, M.A.Lyu, M.Pipatpolkai, T.Glaza, P.Emerson, C.C.Stewart, P.L.Stansfeld, P.J.Yu, E.W.

(2021) mBio 12

  • DOI: https://doi.org/10.1128/mBio.00452-21
  • Primary Citation of Related Structures:  
    7KF5, 7KF6, 7KF7, 7KF8

  • PubMed Abstract: 

    Gram-negative bacteria utilize the resistance-nodulation-cell division (RND) superfamily of efflux pumps to expel a variety of toxic compounds from the cell. The Escherichia coli CusA membrane protein, which recognizes and extrudes biocidal Cu(I) and Ag(I) ions, belongs to the heavy-metal efflux (HME) subfamily of RND efflux pumps. We here report four structures of the trimeric CusA heavy-metal efflux pump in the presence of Cu(I) using single-particle cryo-electron microscopy (cryo-EM). We discover that different CusA protomers within the trimer are able to bind Cu(I) ions simultaneously. Our structural data combined with molecular dynamics (MD) simulations allow us to propose a mechanism for ion transport where each CusA protomer functions independently within the trimer. IMPORTANCE The bacterial RND superfamily of efflux pumps mediate resistance to a variety of biocides, including Cu(I) and Ag(I) ions. Here we report four cryo-EM structures of the trimeric CusA pump in the presence of Cu(I). Combined with MD simulations, our data indicate that each CusA protomer within the trimer recognizes and extrudes Cu(I) independently.


  • Organizational Affiliation

    Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cation efflux system protein CusA
A, B, C
1,055Escherichia coliMutation(s): 0 
Gene Names: cusAybdEb0575JW0564
Membrane Entity: Yes 
UniProt
Find proteins for P38054 (Escherichia coli (strain K12))
Explore P38054 
Go to UniProtKB:  P38054
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38054
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Released Date: 2021-04-14 
  • Deposition Author(s): Moseng, M.A.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01 AI145069

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-14
    Type: Initial release
  • Version 1.1: 2024-03-06
    Changes: Data collection, Database references