Vibrio vulnificus EpsD

Experimental Data Snapshot

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

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This is version 1.4 of the entry. See complete history


Structure and assembly of pilotin-dependent and -independent secretins of the type II secretion system.

Howard, S.P.Estrozi, L.F.Bertrand, Q.Contreras-Martel, C.Strozen, T.Job, V.Martins, A.Fenel, D.Schoehn, G.Dessen, A.

(2019) PLoS Pathog 15: e1007731-e1007731

  • DOI: https://doi.org/10.1371/journal.ppat.1007731
  • Primary Citation of Related Structures:  
    6I1X, 6I1Y, 6I2V

  • PubMed Abstract: 

    The type II secretion system (T2SS) is a cell envelope-spanning macromolecular complex that is prevalent in Gram-negative bacterial species. It serves as the predominant virulence mechanism of many bacteria including those of the emerging human pathogens Vibrio vulnificus and Aeromonas hydrophila. The system is composed of a core set of highly conserved proteins that assemble an inner membrane platform, a periplasmic pseudopilus and an outer membrane complex termed the secretin. Localization and assembly of secretins in the outer membrane requires recognition of secretin monomers by two different partner systems: an inner membrane accessory complex or a highly sequence-diverse outer membrane lipoprotein, termed the pilotin. In this study, we addressed the question of differential secretin assembly mechanisms by using cryo-electron microscopy to determine the structures of the secretins from A. hydrophila (pilotin-independent ExeD) and V. vulnificus (pilotin-dependent EpsD). These structures, at approximately 3.5 Å resolution, reveal pentadecameric stoichiometries and C-terminal regions that carry a signature motif in the case of a pilotin-dependent assembly mechanism. We solved the crystal structure of the V. vulnificus EpsS pilotin and confirmed the importance of the signature motif for pilotin-dependent secretin assembly by performing modelling with the C-terminus of EpsD. We also show that secretin assembly is essential for membrane integrity and toxin secretion in V. vulnificus and establish that EpsD requires the coordinated activity of both the accessory complex EpsAB and the pilotin EpsS for full assembly and T2SS function. In contrast, mutation of the region of the S-domain that is normally the site of pilotin interactions has little effect on assembly or function of the ExeD secretin. Since secretins are essential outer membrane channels present in a variety of secretion systems, these results provide a structural and functional basis for understanding the key assembly steps for different members of this vast pore-forming family of proteins.

  • Organizational Affiliation

    Dept. Biochemistry, Microbiology and Immunology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
General secretion pathway protein GspD
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O
553Vibrio vulnificusMutation(s): 0 
Gene Names: JS86_21435
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
French National Research AgencyFranceANR-10-INSB-05-02
French National Research AgencyFranceANR-10-LABX-49-01
Natural Sciences and Engineering Research Council (Canada)Canada--

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-10
    Type: Initial release
  • Version 1.1: 2019-07-31
    Changes: Data collection, Database references, Refinement description
  • Version 1.2: 2019-11-06
    Changes: Data collection, Refinement description
  • Version 1.3: 2019-12-18
    Changes: Other
  • Version 1.4: 2024-05-15
    Changes: Data collection, Database references, Refinement description