2QKW

Structural basis for activation of plant immunity by bacterial effector protein AvrPto


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.271 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structural basis for activation of plant immunity by bacterial effector protein AvrPto

Xing, W.Zou, Y.Liu, Q.Liu, J.Luo, X.Huang, Q.Chen, S.Zhu, L.Bi, R.Hao, Q.Wu, J.W.Zhou, J.M.Chai, J.

(2007) Nature 449: 243-247

  • DOI: 10.1038/nature06109

  • PubMed Abstract: 
  • Pathogenic microbes use effectors to enhance susceptibility in host plants. However, plants have evolved a sophisticated immune system to detect these effectors using cognate disease resistance proteins, a recognition that is highly specific, often e ...

    Pathogenic microbes use effectors to enhance susceptibility in host plants. However, plants have evolved a sophisticated immune system to detect these effectors using cognate disease resistance proteins, a recognition that is highly specific, often elicits rapid and localized cell death, known as a hypersensitive response, and thus potentially limits pathogen growth. Despite numerous genetic and biochemical studies on the interactions between pathogen effector proteins and plant resistance proteins, the structural bases for such interactions remain elusive. The direct interaction between the tomato protein kinase Pto and the Pseudomonas syringae effector protein AvrPto is known to trigger disease resistance and programmed cell death through the nucleotide-binding site/leucine-rich repeat (NBS-LRR) class of disease resistance protein Prf. Here we present the crystal structure of an AvrPto-Pto complex. Contrary to the widely held hypothesis that AvrPto activates Pto kinase activity, our structural and biochemical analyses demonstrated that AvrPto is an inhibitor of Pto kinase in vitro. The AvrPto-Pto interaction is mediated by the phosphorylation-stabilized P+1 loop and a second loop in Pto, both of which negatively regulate the Prf-mediated defences in the absence of AvrPto in tomato plants. Together, our results show that AvrPto derepresses host defences by interacting with the two defence-inhibition loops of Pto.


    Organizational Affiliation

    National Institute of Biological Sciences, No. 7 Science Park Road, Beijing 102206, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Avirulence protein
A
164Pseudomonas syringaeMutation(s): 0 
Gene Names: avrP
Find proteins for Q08242 (Pseudomonas syringae)
Go to UniProtKB:  Q08242
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein kinase
B
321Solanum pimpinellifoliumMutation(s): 0 
Gene Names: Pto
Find proteins for Q40234 (Solanum pimpinellifolium)
Go to UniProtKB:  Q40234
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
B
L-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.271 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 75.465α = 90.00
b = 94.591β = 90.00
c = 98.741γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction
MAR345dtbdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance