7OKO

Structure of the outer-membrane core complex (outer ring) from a conjugative type IV secretion system


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

Architecture of the outer-membrane core complex from a conjugative type IV secretion system.

Amin, H.Ilangovan, A.Costa, T.R.D.

(2021) Nat Commun 12: 6834-6834

  • DOI: https://doi.org/10.1038/s41467-021-27178-8
  • Primary Citation of Related Structures:  
    7OKN, 7OKO

  • PubMed Abstract: 

    Conjugation is one of the most important processes that bacteria utilize to spread antibiotic resistance genes among bacterial populations. Interbacterial DNA transfer requires a large double membrane-spanning nanomachine called the type 4 secretion system (T4SS) made up of the inner-membrane complex (IMC), the outer-membrane core complex (OMCC) and the conjugative pilus. The iconic F plasmid-encoded T4SS has been central in understanding conjugation for several decades, however atomic details of its structure are not known. Here, we report the structure of a complete conjugative OMCC encoded by the pED208 plasmid from E. coli, solved by cryo-electron microscopy at 3.3 Å resolution. This 2.1 MDa complex has a unique arrangement with two radial concentric rings, each having a different symmetry eventually contributing to remarkable differences in protein stoichiometry and flexibility in comparison to other OMCCs. Our structure suggests that F-OMCC is a highly dynamic complex, with implications for pilus extension and retraction during conjugation.


  • Organizational Affiliation

    MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College, London, SW7 2AZ, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Type IV conjugative transfer system lipoprotein TraV204Salmonella entericaMutation(s): 0 
Gene Names: traVGND40_003952
Membrane Entity: Yes 
UniProt
Find proteins for A0A753A8N9 (Salmonella enterica)
Explore A0A753A8N9 
Go to UniProtKB:  A0A753A8N9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A753A8N9
Sequence Annotations
Expand
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
TraB10Salmonella entericaMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Type-F conjugative transfer system secretin TraK216Salmonella enterica subsp. salamae serovar 58:l,z13,z28:z6Mutation(s): 0 
Gene Names: traKG4J24_003123
Membrane Entity: Yes 
UniProt
Find proteins for A0A734HNY4 (Salmonella enterica subsp. salamae serovar 58:l,z13,z28:z6)
Explore A0A734HNY4 
Go to UniProtKB:  A0A734HNY4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A734HNY4
Sequence Annotations
Expand
  • 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


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom215164/Z/18/Z

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-08
    Type: Initial release
  • Version 1.1: 2024-07-10
    Changes: Data collection