Phosphorylation-Dependent Differential Regulation of Plant Growth,
Cell Death, and Innate Immunity by the Regulatory Receptor-Like Kinase
BAK1


Plants rely heavily on receptor-like kinases (RLKs) for perception and

integration of external and internal stimuli. The Arabidopsis regulatory

leucine-rich repeat RLK (LRR-RLK) BAK1 is involved in steroid hormone responses,

innate immunity, and cell death control. Here, we describe the differential

regulation of three different BAK1-dependent signaling pathways by a novel

allele of BAK1, bak1-5. Innate immune signaling mediated by the

BAK1-dependent RKs FLS2 and EFR is severely compromised in

bak1-5 mutant plants. However, bak1-5

mutants are not impaired in BR signaling or cell death control. We also show

that, in contrast to the RD kinase BRI1, the non-RD kinases FLS2 and EFR have

very low kinase activity, and we show that neither was able to

trans-phosphorylate BAK1 in vitro. Furthermore, kinase activity

for all partners is completely dispensable for the ligand-induced

heteromerization of FLS2 or EFR with BAK1 in planta, revealing

another pathway specific mechanistic difference. The specific suppression of

FLS2- and EFR-dependent signaling in bak1-5 is not due to a

differential interaction of BAK1-5 with the respective ligand-binding RK but

requires BAK1-5 kinase activity. Overall our results demonstrate a

phosphorylation-dependent differential control of plant growth, innate immunity,

and cell death by the regulatory RLK BAK1, which may reveal key differences in

the molecular mechanisms underlying the regulation of ligand-binding RD and

non-RD RKs.


Vyšlo v časopise: Phosphorylation-Dependent Differential Regulation of Plant Growth, Cell Death, and Innate Immunity by the Regulatory Receptor-Like Kinase BAK1. PLoS Genet 7(4): e32767. doi:10.1371/journal.pgen.1002046
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1002046

Souhrn

Plants rely heavily on receptor-like kinases (RLKs) for perception and

integration of external and internal stimuli. The Arabidopsis regulatory

leucine-rich repeat RLK (LRR-RLK) BAK1 is involved in steroid hormone responses,

innate immunity, and cell death control. Here, we describe the differential

regulation of three different BAK1-dependent signaling pathways by a novel

allele of BAK1, bak1-5. Innate immune signaling mediated by the

BAK1-dependent RKs FLS2 and EFR is severely compromised in

bak1-5 mutant plants. However, bak1-5

mutants are not impaired in BR signaling or cell death control. We also show

that, in contrast to the RD kinase BRI1, the non-RD kinases FLS2 and EFR have

very low kinase activity, and we show that neither was able to

trans-phosphorylate BAK1 in vitro. Furthermore, kinase activity

for all partners is completely dispensable for the ligand-induced

heteromerization of FLS2 or EFR with BAK1 in planta, revealing

another pathway specific mechanistic difference. The specific suppression of

FLS2- and EFR-dependent signaling in bak1-5 is not due to a

differential interaction of BAK1-5 with the respective ligand-binding RK but

requires BAK1-5 kinase activity. Overall our results demonstrate a

phosphorylation-dependent differential control of plant growth, innate immunity,

and cell death by the regulatory RLK BAK1, which may reveal key differences in

the molecular mechanisms underlying the regulation of ligand-binding RD and

non-RD RKs.


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Genetika Reprodukčná medicína

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PLOS Genetics


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