PID WAG mediated phosphorylation of the Arabidopsis PIN3 auxin transporter mediates polarity switches during gravitropism Journal Article


Author(s): Grones, Peter; Abas, Melinda; Hajny, Jakub; Jones Angharad; Waidmann Sascha; Kleine-Vehn, Jürgen; Friml, Jiří
Article Title: PID WAG mediated phosphorylation of the Arabidopsis PIN3 auxin transporter mediates polarity switches during gravitropism
Affiliation IST Austria
Abstract: Intercellular distribution of the plant hormone auxin largely depends on the polar subcellular distribution of the plasma membrane PIN-FORMED (PIN) auxin transporters. PIN polarity switches in response to different developmental and environmental signals have been shown to redirect auxin fluxes mediating certain developmental responses. PIN phosphorylation at different sites and by different kinases is crucial for PIN function. Here we investigate the role of PIN phosphorylation during gravitropic response. Loss- and gain-of-function mutants in PINOID and related kinases but not in D6PK kinase as well as mutations mimicking constitutive dephosphorylated or phosphorylated status of two clusters of predicted phosphorylation sites partially disrupted PIN3 phosphorylation and caused defects in gravitropic bending in roots and hypocotyls. In particular, they impacted PIN3 polarity rearrangements in response to gravity and during feed-back regulation by auxin itself. Thus PIN phosphorylation, besides regulating transport activity and apical-basal targeting, is also important for the rapid polarity switches in response to environmental and endogenous signals.
Journal Title: Scientific Reports
Volume: 8
Issue 1
ISSN: 20452322
Publisher: Springer  
Publication Place: England
Date Published: 2018-07-06
Start Page: Article number: 10279 (2018)
DOI: 10.1038/s41598-018-28188-1
Notes: The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program/ERC grant agreements n° 282300 and 742985.
Open access: no