4BJM

Crystal structure of the flax-rust effector avrM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of the Flax-Rust Effector Avrm Reveal Insights Into the Molecular Basis of Plant-Cell Entry and Effector-Triggered Immunity

Ve, T.Williams, S.J.Catanzariti, A.M.Rafiqi, M.Rahman, M.Ellis, J.G.Hardham, A.R.Jones, D.A.Anderson, P.A.Dodds, P.N.Kobe, B.

(2013) Proc.Natl.Acad.Sci.USA 110: 17594

  • DOI: 10.1073/pnas.1307614110
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Fungal and oomycete pathogens cause some of the most devastating diseases in crop plants, and facilitate infection by delivering a large number of effector molecules into the plant cell. AvrM is a secreted effector protein from flax rust (Melampsora ...

    Fungal and oomycete pathogens cause some of the most devastating diseases in crop plants, and facilitate infection by delivering a large number of effector molecules into the plant cell. AvrM is a secreted effector protein from flax rust (Melampsora lini) that can internalize into plant cells in the absence of the pathogen, binds to phosphoinositides (PIPs), and is recognized directly by the resistance protein M in flax (Linum usitatissimum), resulting in effector-triggered immunity. We determined the crystal structures of two naturally occurring variants of AvrM, AvrM-A and avrM, and both reveal an L-shaped fold consisting of a tandem duplicated four-helix motif, which displays similarity to the WY domain core in oomycete effectors. In the crystals, both AvrM variants form a dimer with an unusual nonglobular shape. Our functional analysis of AvrM reveals that a hydrophobic surface patch conserved between both variants is required for internalization into plant cells, whereas the C-terminal coiled-coil domain mediates interaction with M. AvrM binding to PIPs is dependent on positive surface charges, and mutations that abrogate PIP binding have no significant effect on internalization, suggesting that AvrM binding to PIPs is not essential for transport of AvrM across the plant membrane. The structure of AvrM and the identification of functionally important surface regions advance our understanding of the molecular mechanisms underlying how effectors enter plant cells and how they are detected by the plant immune system.


    Related Citations: 
    • Crystallization and X-Ray Diffraction Analysis of the C-Terminal Domain of the Flax Rust Effector Protein Avrm.
      Ve, T.,Williams, S.J.,Stamp, A.,Valkov, E.,Dodds, P.N.,Anderson, P.A.,Kobe, B.
      (2011) Acta Crystallogr.,Sect.F 67: 1603


    Organizational Affiliation

    School of Chemistry and Molecular Biosciences, Australian Infectious Diseases Research Centre and Institute for Molecular Bioscience, University of Queensland, Brisbane, QLD 4072, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AVRM
A, B, C, D
238Melampsora liniMutation(s): 0 
Find proteins for Q2MV46 (Melampsora lini)
Go to UniProtKB:  Q2MV46
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 88.470α = 90.00
b = 125.610β = 90.00
c = 128.860γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
Aimlessdata scaling
BUSTERrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-16
    Type: Initial release
  • Version 1.1: 2013-11-06
    Type: Database references