Proteomics

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Phosphorylation dynamics in a flg22-induced, G-protein dependent network reveals the RGS1 phosphatase


ABSTRACT: The Microbe Associated Molecular Pattern flg22 is recognized in a FLAGELLIN-SENSITVE 2-dependent manner in root tip cells. Here, we show a rapid and massive change in protein abundance and phosphorylation state of the Arabidopsis root cell proteome in wildtype and a mutant deficient in heterotrimeric G-protein-coupled signaling. flg22-induced changes fall on proteins comprising a subset of this proteome, the heterotrimeric G protein interactome, and on highly populated hubs of the immunity network. Approximately 95% of the phosphorylation changes in the heterotrimeric G-protein interactome depend, at least partially, on a functional G protein complex. One member of this interactome is ATBa, a substrate subunit of a protein phosphatase 2A complex and an interactor to REGULATOR OF G SIGNALING 1 protein (AtRGS1), a flg22-phosphorylated, 7-transmembrane spanning modulator of the nucleotide-binding state of the core G-protein complex. A null mutation of ATBa strongly increases basal endocytosis of AtRGS1. AtRGS1 steady-state protein level is lower in the atba mutant in a proteasome-dependent manner. We propose that phosphorylation-dependent endocytosis of AtRGS1 is part of the mechanism to degrade AtRGS1 thus sustaining activation of the heterotrimeric G protein complex required for regulation of system dynamics in innate immunity. The PP2A(ATBa) complex is a critical regulator of this signaling pathway

INSTRUMENT(S): Q Exactive Plus

ORGANISM(S): Arabidopsis Thaliana (ncbitaxon:3702)

SUBMITTER: Justin Walley   Alan Jones  

PROVIDER: MSV000092672 | MassIVE | Wed Aug 16 09:26:00 BST 2023

REPOSITORIES: MassIVE

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The microbe-associated molecular pattern flg22 is recognized in a flagellin-sensitive 2-dependent manner in root tip cells. Here, we show a rapid and massive change in protein abundance and phosphorylation state of the Arabidopsis root cell proteome in WT and a mutant deficient in heterotrimeric G-protein-coupled signaling. flg22-induced changes fall on proteins comprising a subset of this proteome, the heterotrimeric G protein interactome, and on highly-populated hubs of the immunity network. A  ...[more]

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