title: Arabidopsis D6PK is a lipid domain-dependent mediator of root epidermal planar polarity.
abstract: Development of diverse multicellular organisms relies on coordination of single-cell polarities within the plane of the tissue layer (planar polarity). Cell polarity often involves plasma membrane heterogeneity generated by accumulation of specific lipids and proteins into membrane subdomains. Coordinated hair positioning along Arabidopsis root epidermal cells provides a planar polarity model in plants, but knowledge about the functions of proteo-lipid domains in planar polarity signalling remains limited. Here we show that Rho-of-plant (ROP) 2 and 6, phosphatidylinositol-4-phosphate 5-kinase 3 (PIP5K3), DYNAMIN-RELATED PROTEIN (DRP) 1A and DRP2B accumulate in a sterol-enriched, polar membrane domain during root hair initiation. DRP1A, DRP2B, PIP5K3 and sterols are required for planar polarity and the AGCVIII kinase D6 PROTEIN KINASE (D6PK) is a modulator of this process. D6PK undergoes phosphatidylinositol-4,5-bisphosphate- and sterol-dependent basal-to-planar polarity switching into the polar, lipid-enriched domain just before hair formation, unravelling lipid-dependent D6PK localization during late planar polarity signalling.
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.|Institute of Biochemistry and Biology, Plant Physiology, University of Potsdam, Karl-Liebknecht-Str. 24-25, Building 20, DE-14476 Potsdam-Golm, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Stanislas
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.
authors.forename: Anke
authors.initials: A
authors.lastname: Hüser
authors.affiliation: Technische Universität München, Plant Systems Biology, Emil-Ramann-Str. 4,DE-85354 Freising, Germany.
authors.forename: Inês C R
authors.initials: IC
authors.lastname: Barbosa
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.
authors.forename: Christian S
authors.initials: CS
authors.lastname: Kiefer
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.
authors.forename: Klaus
authors.initials: K
authors.lastname: Brackmann
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.
authors.forename: Stefano
authors.initials: S
authors.lastname: Pietra
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.
authors.forename: Anna
authors.initials: A
authors.lastname: Gustavsson
authors.affiliation: Technische Universität München, Plant Systems Biology, Emil-Ramann-Str. 4,DE-85354 Freising, Germany.
authors.forename: Melina
authors.initials: M
authors.lastname: Zourelidou
authors.affiliation: Technische Universität München, Plant Systems Biology, Emil-Ramann-Str. 4,DE-85354 Freising, Germany.
authors.forename: Claus
authors.initials: C
authors.lastname: Schwechheimer
authors.affiliation: Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90 187 Umeå, Sweden.|Institute of Biochemistry and Biology, Plant Physiology, University of Potsdam, Karl-Liebknecht-Str. 24-25, Building 20, DE-14476 Potsdam-Golm, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Grebe