Involvement of the Mitogen-activated Protein Kinase SIMK in Regulation of Root Hair Tip Growth

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2002 Jul 3

PMID 12093731

Citations 52

Authors

Jozef Samaj

Miroslav Ovecka

Andrej Hlavacka

Fatma Lecourieux

Irute Meskiene

Irene Lichtscheidl

Peter Lenart

Jan Salaj

Dieter Volkmann

Laszlo Bogre

Frantisek Baluska

Heribert Hirt

Affiliations

Soon will be listed here.

Abstract

Mitogen-activated protein kinases (MAPKs) are involved in stress signaling to the actin cytoskeleton in yeast and animals. We have analyzed the function of the stress-activated alfalfa MAP kinase SIMK in root hairs. In epidermal cells, SIMK is predominantly nuclear. During root hair formation, SIMK was activated and redistributed from the nucleus into growing tips of root hairs possessing dense F-actin meshworks. Actin depolymerization by latrunculin B resulted in SIMK relocation to the nucleus. Conversely, upon actin stabilization with jasplakinolide, SIMK co-localized with thick actin cables in the cytoplasm. Importantly, latrunculin B and jasplakinolide were both found to activate SIMK in a root-derived cell culture. Loss of tip-focused SIMK and actin was induced by the MAPK kinase inhibitor UO 126 and resulted in aberrant root hairs. UO 126 inhibited targeted vesicle trafficking and polarized growth of root hairs. In contrast, overexpression of gain-of-function SIMK induced rapid tip growth of root hairs and could bypass growth inhibition by UO 126. These data indicate that SIMK plays a crucial role in root hair tip growth.

Citing Articles

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