7Q1V

Arches protomer (trimer of TrwG/VirB8peri) structure from the fully-assembled R388 type IV secretion system determined by cryo-EM.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.18 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 a type IV secretion system.

Mace, K.Vadakkepat, A.K.Redzej, A.Lukoyanova, N.Oomen, C.Braun, N.Ukleja, M.Lu, F.Costa, T.R.D.Orlova, E.V.Baker, D.Cong, Q.Waksman, G.

(2022) Nature 607: 191-196

  • DOI: https://doi.org/10.1038/s41586-022-04859-y
  • Primary Citation of Related Structures:  
    7O3J, 7O3T, 7O3V, 7O41, 7O42, 7O43, 7OIU, 7Q1V

  • PubMed Abstract: 

    Bacterial conjugation is the fundamental process of unidirectional transfer of DNAs, often plasmid DNAs, from a donor cell to a recipient cell 1 . It is the primary means by which antibiotic resistance genes spread among bacterial populations 2,3 . In Gram-negative bacteria, conjugation is mediated by a large transport apparatus-the conjugative type IV secretion system (T4SS)-produced by the donor cell and embedded in both its outer and inner membranes. The T4SS also elaborates a long extracellular filament-the conjugative pilus-that is essential for DNA transfer 4,5 . Here we present a high-resolution cryo-electron microscopy (cryo-EM) structure of a 2.8 megadalton T4SS complex composed of 92 polypeptides representing 8 of the 10 essential T4SS components involved in pilus biogenesis. We added the two remaining components to the structural model using co-evolution analysis of protein interfaces, to enable the reconstitution of the entire system including the pilus. This structure describes the exceptionally large protein-protein interaction network required to assemble the many components that constitute a T4SS and provides insights on the unique mechanism by which they elaborate pili.


  • Organizational Affiliation

    Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College, London, UK. k.mace@mail.cryst.bbk.ac.uk.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TrwG proteinA [auth D],
B [auth E],
C [auth F]
231Escherichia coliMutation(s): 0 
Gene Names: trwG
UniProt
Find proteins for O50335 (Escherichia coli)
Explore O50335 
Go to UniProtKB:  O50335
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO50335
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.18 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom098302
Wellcome TrustUnited Kingdom217089
Wellcome TrustUnited Kingdom202679/Z/16/Z
Wellcome TrustUnited Kingdom206166/Z/17/Z

Revision History  (Full details and data files)

  • Version 1.0: 2022-06-22
    Type: Initial release
  • Version 1.1: 2022-07-06
    Changes: Database references
  • Version 1.2: 2022-07-20
    Changes: Database references
  • Version 1.3: 2024-07-17
    Changes: Data collection