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Journal of Experimental Botany, Vol 50, 1863-1866, Copyright © 1999 by Oxford University Press

ARTICLES

Short communication. H2O2 activates a MAP kinase-like enzyme in Arabidopsis thaliana suspension cultures

R Desikan, A Clarke, J Hancock and S Neill
Department of Biological and Biomedical Sciences, University of the West of England, Coldharbour Lane, Bristol BS16 1QY, UK; Corresponding author; Fax: +44 117 9763871; E-mail: steven.neill@uwe.ac.uk

Treatment of Arabidopsis thaliana suspension cultures with H2O2 results in the activation of a 44 kDa protein kinase with the characteristics of a mitogen activated protein (MAP) kinase. It preferentially phosphorylates myelin basic protein as an artificial substrate, it requires tyrosine phosphorylation for its activity, is tyrosine and threonine phosphorylated upon activation, and its activation is rapid, transient, and occurs in a dose-dependent manner. This is the first demonstration of the activation of a MAP kinase-like enzyme by H2O2 in plants.Keywords: H2O2, MAP kinase, Arabidopsis
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