5T09

The structure of the type III effector HopBA1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.013 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

TIR-only protein RBA1 recognizes a pathogen effector to regulate cell death in Arabidopsis.

Nishimura, M.T.Anderson, R.G.Cherkis, K.A.Law, T.F.Liu, Q.L.Machius, M.Nimchuk, Z.L.Yang, L.Chung, E.H.El Kasmi, F.Hyunh, M.Osborne Nishimura, E.Sondek, J.E.Dangl, J.L.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: E2053-E2062

  • DOI: 10.1073/pnas.1620973114

  • PubMed Abstract: 
  • Detection of pathogens by plants is mediated by intracellular nucleotide-binding site leucine-rich repeat (NLR) receptor proteins. NLR proteins are defined by their stereotypical multidomain structure: an N-terminal Toll-interleukin receptor (TIR) or ...

    Detection of pathogens by plants is mediated by intracellular nucleotide-binding site leucine-rich repeat (NLR) receptor proteins. NLR proteins are defined by their stereotypical multidomain structure: an N-terminal Toll-interleukin receptor (TIR) or coiled-coil (CC) domain, a central nucleotide-binding (NB) domain, and a C-terminal leucine-rich repeat (LRR). The plant innate immune system contains a limited NLR repertoire that functions to recognize all potential pathogens. We isolated Response to the bacterial type III effector protein HopBA1 (RBA1), a gene that encodes a TIR-only protein lacking all other canonical NLR domains. RBA1 is sufficient to trigger cell death in response to HopBA1. We generated a crystal structure for HopBA1 and found that it has similarity to a class of proteins that includes esterases, the heme-binding protein ChaN, and an uncharacterized domain of Pasteurella multocida toxin. Self-association, coimmunoprecipitation with HopBA1, and function of RBA1 require two previously identified TIR-TIR dimerization interfaces. Although previously described as distinct in other TIR proteins, in RBA1 neither of these interfaces is sufficient when the other is disrupted. These data suggest that oligomerization of RBA1 is required for function. Our identification of RBA1 demonstrates that "truncated" NLRs can function as pathogen sensors, expanding our understanding of both receptor architecture and the mechanism of activation in the plant immune system.


    Organizational Affiliation

    Department of Biology, University of North Carolina, Chapel Hill, NC 27599; marcusn@colostate.edu dangl@email.unc.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Type III secretion system effector HopBA1
A
239Pseudomonas syringae pv. aptataMutation(s): 0 
Find proteins for A0A0Q0CD50 (Pseudomonas syringae pv. aptata)
Go to UniProtKB:  A0A0Q0CD50
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.013 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 64.865α = 90.00
b = 64.865β = 90.00
c = 96.380γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
CRANKphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Energy (United States)United StatesDE FG02 95ER20187
National Science Foundation (United States)United States1257373
Howard Hughes Medical InstituteUnited States--

Revision History 

  • Version 1.0: 2017-02-01
    Type: Initial release
  • Version 1.1: 2017-02-15
    Type: Database references
  • Version 1.2: 2017-03-22
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence