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    Science. 2007 Mar 23;315(5819):1712-6. Epub 2007 Mar 8.

    A G protein-coupled receptor is a plasma membrane receptor for the plant hormone abscisic acid.

    Liu X, Yue Y, Li B, Nie Y, Li W, Wu WH, Ma L.

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    National Institute of Biological Sciences, 7 Science Park Road, Zhongguancun Life Science Park, Beijing 102206, China.

    Abstract

    The plant hormone abscisic acid (ABA) regulates many physiological and developmental processes in plants. The mechanism of ABA perception at the cell surface is not understood. Here, we report that a G protein-coupled receptor genetically and physically interacts with the G protein alpha subunit GPA1 to mediate all known ABA responses in Arabidopsis. Overexpressing this receptor results in an ABA-hypersensitive phenotype. This receptor binds ABA with high affinity at physiological concentration with expected kinetics and stereospecificity. The binding of ABA to the receptor leads to the dissociation of the receptor-GPA1 complex in yeast. Our results demonstrate that this G protein-coupled receptor is a plasma membrane ABA receptor.

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    PMID:
    17347412
    [PubMed - indexed for MEDLINE]

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