Arabidopsis ABA response gene AB11: Features of a calcium-modulated protein phosphatase

The Arabidopsis ABI1 locus is essential for a wide spectrum of abscisic acid (ABA) responses throughout plant development. Here, ABI1 was shown to regulate stomatal aperture in leaves and mitotic activity in root meristems. The ABI1 gene was cloned and predicted to encode a signaling protein. Althou...

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Published inScience (American Association for the Advancement of Science) Vol. 264; no. 5164; pp. 1448 - 1452
Main Authors Leung, J, Bouvier-Durand, M, Morris, P-C, Guerrier, D, Chefdor, F, Giraudat, J
Format Journal Article
LanguageEnglish
Published 01.01.1994
Subjects
Arabidopsis thaliana
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Summary:The Arabidopsis ABI1 locus is essential for a wide spectrum of abscisic acid (ABA) responses throughout plant development. Here, ABI1 was shown to regulate stomatal aperture in leaves and mitotic activity in root meristems. The ABI1 gene was cloned and predicted to encode a signaling protein. Although its carboxyl-terminal domain is related to serine-threonine phosphatase 2C, the ABI1 protein has a unique amino-terminal extension containing an EF hand calcium-binding site. These results suggest that the ABI1 protein is a Ca super(2+)-modulated phosphatase and functions to integrate ABA and Ca super(2+) signals with phosphorylation-dependent response pathways.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0036-8075