1. A Xanthomonas oryzae pv. oryzae effector, XopR, associates with receptor-like cytoplasmic kinases and suppresses PAMP-triggered stomatal closure.
- Author
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Wang S, Sun J, Fan F, Tan Z, Zou Y, and Lu D
- Subjects
- Arabidopsis cytology, Arabidopsis genetics, Arabidopsis Proteins genetics, Bacterial Proteins genetics, Blotting, Western, Cell Membrane metabolism, Green Fluorescent Proteins genetics, Green Fluorescent Proteins metabolism, Microscopy, Confocal, Mutation, Oryza cytology, Oryza microbiology, Phosphorylation, Plant Stomata genetics, Plant Stomata physiology, Plants, Genetically Modified, Protein Binding, Protein Serine-Threonine Kinases genetics, Protoplasts cytology, Protoplasts metabolism, Xanthomonas genetics, Xanthomonas physiology, Arabidopsis metabolism, Arabidopsis Proteins metabolism, Bacterial Proteins metabolism, Pathogen-Associated Molecular Pattern Molecules metabolism, Plant Stomata metabolism, Protein Serine-Threonine Kinases metabolism, Xanthomonas metabolism
- Abstract
Receptor-like kinases (RLKs) play important roles in plant immunity signaling; thus, many are hijacked by pathogen effectors to promote successful pathogenesis. Xanthomonas oryzae pv. oryzae (Xoo) is the causal agent of rice leaf blight disease. The strain PXO99A has 18 non-TAL (transcription activation-like) effectors; however, their mechanisms of action and host target proteins remain largely unknown. Although the effector XopR from the Xoo strain MAFF311018 was shown to suppress PAMP-triggered immune responses in Arabidopsis, its target has not yet been identified. Here, we show that PXO99A XopR interacts with BIK1 at the plasma membrane. BIK1 is a receptor-like cytoplasmic kinase (RLCK) belonging to the RLK family of proteins and mediates PAMP-triggered stomatal immunity. In turn, BIK1 phosphorylates XopR. Furthermore, XopR suppresses PAMP-triggered stomatal closure in transgenic Arabidopsis expressing XopR. In addition, XopR is able to associate with RLCKs other than BIK1. These results suggest that XopR likely suppresses plant immunity by targeting BIK1 and other RLCKs.
- Published
- 2016
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