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, 7 (4), 290-301

Receptor-like Cytoplasmic Kinases Integrate Signaling From Multiple Plant Immune Receptors and Are Targeted by a Pseudomonas Syringae Effector

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Receptor-like Cytoplasmic Kinases Integrate Signaling From Multiple Plant Immune Receptors and Are Targeted by a Pseudomonas Syringae Effector

Jie Zhang et al. Cell Host Microbe.

Abstract

Cell-surface-localized plant immune receptors, such as FLS2, detect pathogen-associated molecular patterns (PAMPs) and initiate PAMP-triggered immunity (PTI) through poorly understood signal-transduction pathways. The pathogenic Pseudomonas syringae effector AvrPphB, a cysteine protease, cleaves the Arabidopsis receptor-like cytoplasmic kinase PBS1 to trigger cytoplasmic immune receptor RPS5-specified effector-triggered immunity (ETI). Analyzing the function of AvrPphB in plants lacking RPS5, we find that AvrPphB can inhibit PTI by cleaving additional PBS1-like (PBL) kinases, including BIK1, PBL1, and PBL2. In unstimulated plants, BIK1 and PBL1 interact with FLS2 and are rapidly phosphorylated upon FLS2 activation by its ligand flg22. Genetic and molecular analyses indicate that BIK1, and possibly PBL1, PBL2, and PBS1, integrate immune signaling from multiple immune receptors. Whereas AvrPphB-mediated degradation of one of these kinases, PBS1, is monitored by RPS5 to initiate ETI, this pathogenic effector targets other PBL kinases for PTI inhibition.

Comment in

  • Battling Immune Kinases in Plants
    B Day et al. Cell Host Microbe 7 (4), 259-61. PMID 20413093.
    As part of innate immune signaling, plants employ a suite of receptors, kinases, and resistance proteins to recognize pathogen-derived effector proteins. In this issue of …

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