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First published online September 6, 2002; 10.1104/pp.001354

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Plant Physiol, October 2002, Vol. 130, pp. 837-846

The Abscisic Acid-Responsive Kinase PKABA1 Interacts with a Seed-Specific Abscisic Acid Response Element-Binding Factor, TaABF, and Phosphorylates TaABF Peptide Sequences1

Russell R. Johnson,* Ryan L. Wagner,2 Steven D. Verhey,3 and Mary K. Walker-Simmons4

Department of Biology, Colby College, Waterville, Maine 04901 (R.R.J.); and United States Department of Agriculture-Agricultural Research Service, Washington State University, Pullman, Washington 99164-6420 (R.L.W., S.D.V., M.K.W.-S.)

The abscisic acid (ABA)-induced protein kinase PKABA1 is present in dormant seeds and is a component of the signal transduction pathway leading to ABA-suppressed gene expression in cereal grains. We have identified a member of the ABA response element-binding factor (ABF) family of basic leucine zipper transcription factors from wheat (Triticum aestivum) that is specifically bound by PKABA1. This protein (TaABF) has highest sequence similarity to the Arabidopsis ABA response protein ABI5. In two-hybrid assays TaABF bound only to PKABA1, but not to a mutant version of PKABA1 lacking the nucleotide binding domain, suggesting that binding of TaABF requires prior binding of ATP as would be expected for binding of a protein substrate by a protein kinase. TaABF mRNA accumulated together with PKABA1 mRNA during wheat grain maturation and dormancy acquisition and TaABF transcripts increased transiently during imbibition of dormant grains. In contrast to PKABA1 mRNA, TaABF mRNA is seed specific and did not accumulate in vegetative tissues in response to stress or ABA application. PKABA1 produced in transformed cell lines was able to phosphorylate synthetic peptides representing three specific regions of TaABF. These data suggest that TaABF may serve as a physiological substrate for PKABA1 in the ABA signal transduction pathway during grain maturation, dormancy expression, and ABA-suppressed gene expression.

1 This work was supported by the National Science Foundation (Wheat Genome grant), by the U.S. Department of Agriculture-National Research Initiative Competitive Grants Program (grant no. 98-35300-6186), and by the Colby College Natural Science Division (grants).

2 Present address: Department of Botany, Iowa State University, Ames, IA 50010.

3 Present address: Department of Biological Sciences, Central Washington University, Ellensburg, WA 98926.

4 Present address: U.S. Department of Agriculture-Agricultural Research Service, National Program Staff, 5601 Sunnyside Avenue, Room 4-2210, Beltsville, MD 20705-5139.

* Corresponding author; e-mail rrjohnso{at}colby.edu; fax 207-872-3731.

© 2002 American Society of Plant Physiologists


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