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• W2016174913 abstract "The Arabidopsis thaliana SOS1 protein is a putative Na + /H + antiporter that functions in Na + extrusion and is essential for the NaCl tolerance of plants. sos1 mutant plants share phenotypic similarities with mutants lacking the protein kinase SOS2 and the Ca 2+ sensor SOS3. To investigate whether the three SOS proteins function in the same response pathway, we have reconstituted the SOS system in yeast cells. Expression of SOS1 improved the Na + tolerance of yeast mutants lacking endogenous Na + transporters. Coexpression of SOS2 and SOS3 dramatically increased SOS1-dependent Na + tolerance, whereas SOS2 or SOS3 individually had no effect. The SOS2/SOS3 kinase complex promoted the phosphorylation of SOS1. A constitutively active form of SOS2 phosphorylated SOS1 in vitro independently of SOS3, but could not fully substitute for the SOS2/SOS3 kinase complex for activation of SOS1 in vivo . Further, we show that SOS3 recruits SOS2 to the plasma membrane. Although sos1 mutant plants display defective K + uptake at low external concentrations, neither the unmodified nor the SOS2/SOS3-activated SOS1 protein showed K + transport capacity in vivo , suggesting that the role of SOS1 on K + uptake is indirect. Our results provide an example of functional reconstitution of a plant response pathway in a heterologous system and demonstrate that the SOS1 ion transporter, the SOS2 protein kinase, and its associated Ca 2+ sensor SOS3 constitute a functional module. We propose a model in which SOS3 activates and directs SOS2 to the plasma membrane for the stimulatory phosphorylation of the Na + transporter SOS1." @default.
• W2016174913 created "2016-06-24" @default.
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• W2016174913 date "2002-06-17" @default.
• W2016174913 modified "2023-10-11" @default.
• W2016174913 title "Reconstitution in yeast of the <i>Arabidopsis</i> SOS signaling pathway for Na ⁺ homeostasis" @default.
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• W2016174913 doi "https://doi.org/10.1073/pnas.132092099" @default.
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