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Suppression of the AvrBs1-specific hypersensitive response by the YopJ effector homolog AvrBsT from Xanthomonas depends on a SNF1-related kinase
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Suppression of the AvrBs1-specific hypersensitive response by the YopJ effector homolog AvrBsT from Xanthomonas depends on a SNF1-related kinase
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Journal Article
Suppression of the AvrBs1-specific hypersensitive response by the YopJ effector homolog AvrBsT from Xanthomonas depends on a SNF1-related kinase
2010
Overview
Pathogenicity of the Gram-negative plant pathogen Xanthomonas campestris pv. vesicatoria (Xcv) depends on a type III secretion system that translocates a cocktail of > 25 type III effector proteins into the plant cell. In this study, we identified the effector AvrBsT as a suppressor of specific plant defense. AvrBsT belongs to the YopJ/AvrRxv protein family, members of which are predicted to act as proteases and/or acetyltransferases. AvrBsT suppresses the hypersensitive response (HR) that is elicited by the effector protein AvrBs1 from Xcv in resistant pepper plants. HR suppression occurs inside the plant cell and depends on a conserved predicted catalytic residue of AvrBsT. Yeast two-hybrid based analyses identified plant interaction partners of AvrBs1 and AvrBsT, including a putative regulator of sugar metabolism, SNF1-related kinase 1 (SnRK1), as interactor of AvrBsT. Intriguingly, gene silencing experiments revealed that SnRK1 is required for the induction of the AvrBs1-specific HR. We therefore speculate that SnRK1 is involved in the AvrBsT-mediated suppression of the AvrBs1-specific HR.
Publisher
Oxford, UK : Blackwell Publishing Ltd,Blackwell Publishing,Blackwell Publishing Ltd,Wiley Subscription Services, Inc
Subject
/ AvrRxv
/ Bacterial Proteins - metabolism
/ genetics
/ Homology
/ Host-Pathogen Interactions - physiology
/ Kinases
/ Leaves
/ pepper
/ Peppers
/ Plant Diseases - microbiology
/ Plants
/ protease
/ Protein Serine-Threonine Kinases
/ Protein-Serine-Threonine Kinases - genetics
/ Protein-Serine-Threonine Kinases - metabolism
/ Proteins
/ sugars
/ two hybrid system techniques
/ Xanthomonas campestris - metabolism
/ Xanthomonas campestris - pathogenicity
/ Yeast
/ Yeasts
/ YopJ
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