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Reference: Bertauche N, et al. (1996) Protein phosphatase activity of abscisic acid insensitive 1 (ABI1) protein from Arabidopsis thaliana. Eur J Biochem 241(1):193-200

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Abstract


Mutations at the ABI1 (abscisic acid insensitive 1) locus of the plant Arabidopsis thaliana cause a reduction in sensitivity to the plant hormone abscisic acid. The sequence of ABI1 predicts a protein composed of an N-terminal domain that contains motifs for an EF-hand Ca(2+)-binding site, and a C-terminal domain with similarities to protein serine/threonine phosphatases 2C. We report here two sets of experimental evidence that indicate that ABI1 has typical protein phosphatase 2C activity. First, expression of the ABI1 C-terminal domain partially complemented the temperature-sensitive growth defect of a Saccharomyces cerevisiae protein phosphatase 2C mutant. Second, recombinant proteins that contained the ABI1 C-terminal domain displayed in vitro phosphatase activity towards 32P-labelled casein, and this activity displayed Mg2+ or Mn2+ dependence and okadaic acid insensitivity typical of protein phosphatases 2C. Characterisation of recombinant proteins that contained various portions of ABI1 indicated that the putative EF-hand motif is unlikely to mediate Ca2+ regulation of the ABI1 phosphatase activity at physiological Ca2+ concentrations, and may represent in EF-hand analogue rather than an EF-hand homologue. The abil-l mutation appeared to cause significant reduction in the phosphatase activity of ABI1. These results are discussed in relation to the dominant phenotype of abil-l over the wild-type allele in plants, and to the possible role of ABI1 in abscisic acid signalling.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Bertauche N, Leung J, Giraudat J
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