WAPK, a Ser/Thr protein kinase gene of Nicotiana tabacum, is uniquely regulated by wounding, abscisic acid and methyl jasmonate

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A cDNA encoding a protein kinase, which may be involved in the wound signal transduction pathway, was isolated from Nicotiana tabacum. The cDNA, named WAPK, is 1227 bp in length and contains an ORF of 1017 bp. The ORF encodes a polypeptide of 339 amino acids, with a calculated molecular mass of 38234 Da. Analysis of the deduced amino acid sequence shows that the N-terminal region of WAPK contains a catalytic region composed of eleven subdomains which are typically found in Ser/Thr protein kinases. This region shows 78-84% sequence identity with similar regions of abscisic acid (ABA)-induced and external-stimuli-responsive protein kinases. However, the C-terminal region of WAPK shows little homology with similar regions of Ser/Thr protein kinases, except for a 16-amino acid stretch near the end of the catalytic domain. Kinase assays using a WAPK fusion protein expressed in E. coli revealed that WAPK autophosphorylates on serine residue(s). The WAPK gene is predominantly expressed in flowers, moderately in roots, and poorly in leaves. Transcripts were not detected in stems. The WAPK gene was induced by wounding (within 1.5 h), by abscisic acid (within 0.5 h), and by methyl jasmonate (within 2 h). The induction pattern of WAPK mRNA upon wounding was not affected by treatment with diethyldithiocarbamic acid, a reagent which inhibits jasmonic acid biosynthesis. These results suggest that the WAPK gene is regulated by ABA in the wound signal transduction pathway.
Publisher
SPRINGER VERLAG
Issue Date
1998
Language
English
Article Type
Article
Keywords

SIGNAL-TRANSDUCTION PATHWAYS; INHIBITOR-II GENE; ARABIDOPSIS-THALIANA; TOMATO LEAVES; DIFFERENTIAL EXPRESSION; INDUCIBLE GENES; OSMOTIC-STRESS; PLANT-LEAVES; MAP KINASE; INDUCTION

Citation

MOLECULAR AND GENERAL GENETICS, v.259, no.5, pp.516 - 522

ISSN
0026-8925
DOI
10.1007/s004380050843
URI
http://hdl.handle.net/10203/69117
Appears in Collection
BS-Journal Papers(저널논문)
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