Crystal structure of Type VI secretion system effector, TseH (VCA0285)

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 

wwPDB Validation   3D Report Full Report

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Envelope stress responses defend against type six secretion system attacks independently of immunity proteins.

Hersch, S.J.Watanabe, N.Stietz, M.S.Manera, K.Kamal, F.Burkinshaw, B.Lam, L.Pun, A.Li, M.Savchenko, A.Dong, T.G.

(2020) Nat Microbiol 5: 706-714

  • DOI: https://doi.org/10.1038/s41564-020-0672-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The arms race among microorganisms is a key driver in the evolution of not only the weapons but also defence mechanisms. Many Gram-negative bacteria use the type six secretion system (T6SS) to deliver toxic effectors directly into neighbouring cells. Defence against effectors requires cognate immunity proteins. However, here we show immunity-independent protection mediated by envelope stress responses in Escherichia coli and Vibrio cholerae against a V. cholerae T6SS effector, TseH. We demonstrate that TseH is a PAAR-dependent species-specific effector highly potent against Aeromonas species but not against its V. cholerae immunity mutant or E. coli. A structural analysis reveals TseH is probably a NlpC/P60-family cysteine endopeptidase. We determine that two envelope stress-response pathways, Rcs and BaeSR, protect E. coli from TseH toxicity by mechanisms including capsule synthesis. The two-component system WigKR (VxrAB) is critical for protecting V. cholerae from its own T6SS despite expressing immunity genes. WigR also regulates T6SS expression, suggesting a dual role in attack and defence. This deepens our understanding of how bacteria survive T6SS attacks and suggests that defence against the T6SS represents a major selective pressure driving the evolution of species-specific effectors and protective mechanisms mediated by envelope stress responses and capsule synthesis.

  • Organizational Affiliation

    Department of Ecosystem and Public Health, University of Calgary, Calgary, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cysteine hydrolase203Vibrio choleraeMutation(s): 0 
Gene Names: C9J66_18215ERS013186_03768ERS013193_04941ERS013197_05943ERS013198_03598ERS013200_03989ERS013202_03729ERS013206_03782FPV63_00060
Find proteins for Q9KMN9 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KMN9 
Go to UniProtKB:  Q9KMN9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KMN9
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CAF
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.756α = 90
b = 63.645β = 90
c = 70.292γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
HKL-3000data reduction
HKL-3000data scaling
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

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

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-15
    Type: Initial release
  • Version 1.1: 2020-03-11
    Changes: Database references
  • Version 1.2: 2020-05-13
    Changes: Database references