6TYI

ExbB-ExbD complex in MSP1E3D1 nanodisc


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 1.3 of the entry. See complete history


Literature

Cryo-EM structure of the bacterial Ton motor subcomplex ExbB-ExbD provides information on structure and stoichiometry.

Celia, H.Botos, I.Ni, X.Fox, T.De Val, N.Lloubes, R.Jiang, J.Buchanan, S.K.

(2019) Commun Biol 2: 358-358

  • DOI: https://doi.org/10.1038/s42003-019-0604-2
  • Primary Citation of Related Structures:  
    6TYI

  • PubMed Abstract: 

    The TonB-ExbB-ExbD molecular motor harnesses the proton motive force across the bacterial inner membrane to couple energy to transporters at the outer membrane, facilitating uptake of essential nutrients such as iron and cobalamine. TonB physically interacts with the nutrient-loaded transporter to exert a force that opens an import pathway across the outer membrane. Until recently, no high-resolution structural information was available for this unique molecular motor. We published the first crystal structure of ExbB-ExbD in 2016 and showed that five copies of ExbB are arranged as a pentamer around a single copy of ExbD. However, our spectroscopic experiments clearly indicated that two copies of ExbD are present in the complex. To resolve this ambiguity, we used single-particle cryo-electron microscopy to show that the ExbB pentamer encloses a dimer of ExbD in its transmembrane pore, and not a monomer as previously reported. The revised stoichiometry has implications for motor function.


  • Organizational Affiliation

    1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892 USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Biopolymer transport protein ExbB
A, B, C, D, E
244Escherichia coli K-12Mutation(s): 0 
Gene Names: exbBb3006JW2974
Membrane Entity: Yes 
UniProt
Find proteins for P0ABU7 (Escherichia coli (strain K12))
Explore P0ABU7 
Go to UniProtKB:  P0ABU7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ABU7
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Biopolymer transport protein ExbDF [auth Y],
G [auth Z]
163Escherichia coli K-12Mutation(s): 0 
Gene Names: exbDb3005JW2973
Membrane Entity: Yes 
UniProt
Find proteins for P0ABV2 (Escherichia coli (strain K12))
Explore P0ABV2 
Go to UniProtKB:  P0ABV2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ABV2
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
Department of Health & Human Services (HHS)United StatesZIA DK01101111

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-16
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-15
    Changes: Author supporting evidence
  • Version 1.3: 2024-03-20
    Changes: Data collection, Database references