Plant Physiol.
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Plant Physiology 89:743-752 (1989)
© 1989 American Society of Plant Biologists

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Molecular Biology and Gene Regulation

An Auxin-Regulated Gene of Arabidopsis thaliana Encodes a DNA-Binding Protein 1

Thierry Alliotte, Christine Tiré, Gilbert Engler, Johan Peleman, Allan Caplan, Marc Van Montagu and Dirk Inzé

Laboratorium voor Genetica, Rijksuniversiteit Gent, B-9000 Gent, Belgium

We have isolated a single-copy gene from the plant Arabidopsis thaliana, called dbp, which encodes a lysine-rich, DNA-binding protein. The Dbp protein has a molecular weight and a composition resembling histone H1. When the dbp gene was expressed in bacteria, the protein product bound DNA nonspecifically. The dbp gene is expressed constitutively in all parts of the plant but is induced five times above this basal level in apical zones. In vitro hormone-depletion experiments showed that the expression in the shoot apex could be induced by exogenous auxin. In situ hybridizations in the root apex indicated that the expression of dbp is enhanced in the region of cell division.

1 This work was supported by grants from the A.S.L.K. Kankerfonds, the Fonds voor Geneeskundig Wetenschappelijk Onderzoek (FGWO 3.000 1.82), and the Services of the Prime Minister (00A 12.056 1.84 and UIAP 120C0187). T. A. is indebted to L'Air Liquide S.A. for financial support, C. T. is a Research Assistant, and D. I. a Senior Research Assistant of the National Fund for Scientific Research (Belgium).




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Copyright © 1989 by the American Society of Plant Biologists