Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Mitogen-Activated Protein Kinase Kinase 3 Is Required for Regulation during Dark-Light Transition

  • Lee, Horim (Department of Pre-PharmMed, College of Natural Sciences, Duksung Women's University)
  • Received : 2015.03.03
  • Accepted : 2015.04.06
  • Published : 2015.07.31
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Abstract

Plant growth and development are coordinately orchestrated by environmental cues and phytohormones. Light acts as a key environmental factor for fundamental plant growth and physiology through photosensory phytochromes and underlying molecular mechanisms. Although phytochromes are known to possess serine/threonine protein kinase activities, whether they trigger a signal transduction pathway via an intracellular protein kinase network remains unknown. In analyses of mitogen-activated protein kinase kinase (MAPKK, also called MKK) mutants, the mkk3 mutant has shown both a hypersensitive response in plant hormone gibberellin (GA) and a less sensitive response in red light signaling. Surprisingly, light-induced MAPK activation in wild-type (WT) seedlings and constitutive MAPK phosphorylation in dark-grown mkk3 mutant seedlings have also been found, respectively. Therefore, this study suggests that MKK3 acts in negative regulation in darkness and in light-induced MAPK activation during dark-light transition.

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References

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