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PID/WAG-mediated phosphorylation of the Arabidopsis PIN3 auxin transporter mediates polarity switches during gravitropism

Grones, Peter, Abas, Melinda, Hajný, Jakub, Jones, Angharad ORCID:, Waidmann, Sascha, Kleine-Vehn, Jürgen and Friml, Jiří 2018. PID/WAG-mediated phosphorylation of the Arabidopsis PIN3 auxin transporter mediates polarity switches during gravitropism. Scientific Reports 8 , 10279. 10.1038/s41598-018-28188-1

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License.
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 2 August 2018
Date of Acceptance: 14 June 2018
Last Modified: 05 May 2023 13:26

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