2QKW

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.271 
  • R-Value Observed: 0.274 

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
  • Primary Citation of Related Structures:  
    2QKW

  • 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Avirulence proteinA164Pseudomonas syringaeMutation(s): 0 
Gene Names: avrPEIZ61_05000
Find proteins for Q08242 (Pseudomonas syringae)
Explore Q08242 
Go to UniProtKB:  Q08242
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein kinaseB321Solanum pimpinellifoliumMutation(s): 0 
Gene Names: Pto
EC: 2.7.11.1
Find proteins for Q40234 (Solanum pimpinellifolium)
Explore Q40234 
Go to UniProtKB:  Q40234
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
BL-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
BL-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.271 
  • R-Value Observed: 0.274 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.465α = 90
b = 94.591β = 90
c = 98.741γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345dtbdata collection
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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