Short communication. H2O2 activates a MAP kinase-like enzyme in Arabidopsis thaliana suspension cultures |
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| Authors: | Desikan R; Clarke A; Hancock J; Neill S |
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| Institution: | 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 |
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| Abstract: | 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. |
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