Wound-Induced Expression and Activation of WIG, a Novel Glycogen Synthase Kinase 3

AUTOR(ES)

Jonak, Claudia

FONTE

American Society of Plant Physiologists

RESUMO

Glycogen synthase kinase 3 (GSK-3) is involved in the regulation of several physiological processes, including glycogen metabolism, protein synthesis, transcription factor activity, and developmental control. Although GSK-3–like genes have been isolated from plants, no function for any of these kinases has been defined. We report here that the alfalfa wound-induced gene (WIG, for wound-induced GSK-3), lencoding a functional plant GSK-3–like kinase, is activated when the alfalfa leaves are wounded. Although WIG transcripts are hardly detectable in mature leaves, WIG mRNA accumulates rapidly after wounding. Using a peptide antibody that specifically recognizes p53WIG, we show that p53WIGkinase is activated immediately after wounding. Wound-induced activation of p53WIGkinase is a post-translational process, because the concentrations of p53WIGprotein do not change in intact and wounded leaves, and inhibition of transcription or translation does not block activation by wounding. However, inactivation of p53WIGkinase, which usually occurs within 60 min after wounding, is dependent on transcription and translation of one or more protein factors. These data suggest that the WIG kinase is involved in wound signaling in plants.

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