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Abstract:
The plant hormone abscisic acid (ABA) regulates many physiologicaland developmental processes in plants. The mechanism of ABAperception at the cell surface is not understood. Here, we reportthat a G proteincoupled receptor genetically and physicallyinteracts with the G protein subunit GPA1 to mediate all knownABA responses in Arabidopsis. Overexpressing this receptor resultsin an ABA-hypersensitive phenotype. This receptor binds ABAwith high affinity at physiological concentration with expectedkinetics and stereospecificity. The binding of ABA to the receptorleads to the dissociation of the receptor-GPA1 complex in yeast.Our results demonstrate that this G proteincoupled receptoris a plasma membrane ABA receptor.
1 National Institute of Biological Sciences, 7 Science Park Road, Zhongguancun Life Science Park, Beijing 102206, China. 2 Laboratory of Molecular and Cellular Biology, Hebei Normal University, Shijiazhuang, Hebei 050016, China. 3 State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100094, China.
* To whom correspondence should be addressed. E-mail: maligeng{at}nibs.ac.cn
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