The Arabidopsis SOS2 protein kinase physically interacts with and is activated by the calcium-binding protein SOS3.

@article{Halfter2000TheAS,
  title={The Arabidopsis SOS2 protein kinase physically interacts with and is activated by the calcium-binding protein SOS3.},
  author={Ursula Halfter and Manabu Ishitani and J. K. Zhu},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2000},
  volume={97 7},
  pages={
          3735-40
        }
}
The Arabidopsis thaliana SOS2 and SOS3 genes are required for intracellular Na(+) and K(+) homeostasis and plant tolerance to high Na(+) and low K(+) environments. SOS3 is an EF hand type calcium-binding protein having sequence similarities with animal neuronal calcium sensors and the yeast calcineurin B. SOS2 is a serine/threonine protein kinase in the SNF1/AMPK family. We report here that SOS3 physically interacts with and activates SOS2 protein kinase. Genetically, sos2sos3 double mutant… CONTINUE READING
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