6B12

Structure of Tne2 in complex with Tni2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Diverse NADase effector families mediate interbacterial antagonism via the type VI secretion system.

Tang, J.Y.Bullen, N.P.Ahmad, S.Whitney, J.C.

(2018) J. Biol. Chem. 293: 1504-1514

  • DOI: 10.1074/jbc.RA117.000178

  • PubMed Abstract: 
  • The bacterial type VI secretion system (T6SS) mediates antagonistic cell-cell interactions between competing Gram-negative bacteria. In plant-beneficial bacteria, this pathway has been shown to suppress the growth of bacterial pathogens; however, the ...

    The bacterial type VI secretion system (T6SS) mediates antagonistic cell-cell interactions between competing Gram-negative bacteria. In plant-beneficial bacteria, this pathway has been shown to suppress the growth of bacterial pathogens; however, the identification and mode of action of T6SS effector proteins that mediate this protective effect remain poorly defined. Here, we identify two previously uncharacterized effectors required for interbacterial antagonism by the plant commensal bacterium Pseudomonas protegens. Consistent with the established effectorimmunity paradigm for antibacterial T6SS substrates, the toxic activities of these effectors are neutralized by adjacently encoded cognate immunity determinants. While one of these effectors, RhsA, belongs to family of DNase enzymes, the activity of the other was not apparent from its sequence. To determine the mechanism of toxicity of this latter effector, we determined its 1.3Å crystal structure in complex with its immunity protein and found that it resembles NAD(P)+ degrading enzymes. In line with this structural similarity, biochemical characterization of this effector, termed Tne2 (type VI secretion NADase effector family 2), demonstrates that it possesses potent NAD(P)+ hydrolase activity. Tne2 is the founding member of a widespread family of interbacterial NADases predicted to transit not only the Gramnegative T6SS but also the Gram-positive type VII secretion system, a pathway recently implicated in interbacterial competition among Firmicutes. Together, this work identifies new T6SS effectors employed by a plant commensal bacterium to antagonize its competitors and broadly implicates NAD(P)+ hydrolyzing enzymes as substrates of interbacterial conflict pathways found in diverse bacterial phyla.


    Organizational Affiliation

    McMaster University, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tne2
A, D
135Pseudomonas fluorescens (strain ATCC BAA-477 / NRRL B-23932 / Pf-5)Mutation(s): 0 
Find proteins for Q4K3B6 (Pseudomonas fluorescens (strain ATCC BAA-477 / NRRL B-23932 / Pf-5))
Go to UniProtKB:  Q4K3B6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Tni2
B, C
153Pseudomonas fluorescens (strain ATCC BAA-477 / NRRL B-23932 / Pf-5)Mutation(s): 0 
Find proteins for Q4K3B5 (Pseudomonas fluorescens (strain ATCC BAA-477 / NRRL B-23932 / Pf-5))
Go to UniProtKB:  Q4K3B5
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 176.690α = 90.00
b = 40.560β = 97.24
c = 95.910γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
PHENIXphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (Canada)Canada--

Revision History 

  • Version 1.0: 2017-12-20
    Type: Initial release
  • Version 1.1: 2017-12-27
    Type: Database references
  • Version 1.2: 2018-02-21
    Type: Database references