4Z4A

Avirulence protein 4 (Avr4) from Pseudocercospora fuligena


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Analysis of an Avr4 Effector Ortholog Offers Insight into Chitin Binding and Recognition by the Cf-4 Receptor.

Kohler, A.C.Chen, L.H.Hurlburt, N.Salvucci, A.Schwessinger, B.Fisher, A.J.Stergiopoulos, I.

(2016) Plant Cell 28: 1945-1965

  • DOI: 10.1105/tpc.15.00893

  • PubMed Abstract: 
  • Chitin is a key component of fungal cell walls and a potent inducer of innate immune responses. Consequently, fungi may secrete chitin-binding lectins, such as the Cf-Avr4 effector protein from the tomato pathogen Cladosporium fulvum, to shield chiti ...

    Chitin is a key component of fungal cell walls and a potent inducer of innate immune responses. Consequently, fungi may secrete chitin-binding lectins, such as the Cf-Avr4 effector protein from the tomato pathogen Cladosporium fulvum, to shield chitin from host-derived chitinases during infection. Homologs of Cf-Avr4 are found throughout Dothideomycetes, and despite their modest primary sequence identity, many are perceived by the cognate tomato immune receptor Cf-4. Here, we determined the x-ray crystal structure of Pf-Avr4 from the tomato pathogen Pseudocercospora fuligena, thus providing a three-dimensional model of an Avr4 effector protein. In addition, we explored structural, biochemical, and functional aspects of Pf-Avr4 and Cf-Avr4 to further define the biology of core effector proteins and outline a conceptual framework for their pleiotropic recognition by single immune receptors. We show that Cf-Avr4 and Pf-Avr4 share functional specificity in binding (GlcNAc)6 and in providing protection against plant- and microbial-derived chitinases, suggesting a broader role beyond deregulation of host immunity. Furthermore, structure-guided site-directed mutagenesis indicated that residues in Pf-Avr4 important for binding chitin do not directly influence recognition by Cf-4 and further suggested that the property of recognition is structurally separated or does not fully overlap with the virulence function of the effector.


    Organizational Affiliation

    Department of Plant Pathology, University of California Davis, Davis, California 95616.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Carbohydrate-binding module family 14 protein
A, B
121Pseudocercospora fijiensis (strain CIRAD86)Mutation(s): 0 
Find proteins for M3AZE0 (Pseudocercospora fijiensis (strain CIRAD86))
Go to UniProtKB:  M3AZE0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.183 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 57.100α = 90.00
b = 57.100β = 90.00
c = 126.980γ = 120.00
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXphasing
XDSdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
University of CaliforniaUnited StatesRI-091

Revision History 

  • Version 1.0: 2016-06-29
    Type: Initial release
  • Version 1.1: 2016-07-13
    Type: Source and taxonomy
  • Version 1.2: 2016-07-27
    Type: Database references
  • Version 1.3: 2016-09-14
    Type: Database references