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SnRK2s: Kinases or Substrates?

Yunmin Wei1, Linzhu Peng2, Xiangui Zhou2

  • 1Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou 466001, China.

Plants (Basel, Switzerland)
|April 26, 2025
PubMed
Summary

Plants utilize sucrose non-fermenting-1-related protein kinase 2 (SnRK2) for stress adaptation. This review systematically classifies SnRK2 substrates and explores its post-translational modifications, revealing new strategies for engineering stress-resilient crops.

Keywords:
SnRK2phosphorylationpost-translational modificationsubstrates

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Area of Science:

  • Plant molecular biology
  • Plant physiology
  • Biochemistry

Background:

  • Plants activate complex stress-signaling networks involving protein kinases to survive environmental adversities.
  • Sucrose non-fermenting-1-related protein kinase 2 (SnRK2) is a key regulator of plant stress responses, phosphorylating downstream targets to control gene expression and physiological changes.
  • Existing research has identified numerous SnRK2 substrates but lacks systematic classification and functional analysis.

Purpose of the Study:

  • To systematically review and classify SnRK2-phosphorylated substrates in *Arabidopsis thaliana*.
  • To elucidate the functional roles of these substrates in plant stress signaling and development.
  • To explore the impact of various post-translational modifications (PTMs) on SnRK2 regulation.

Main Methods:

  • Literature review and synthesis of recent research on SnRK2 substrates and PTMs.
  • Analysis of characterized SnRK2-phosphorylated targets in *Arabidopsis thaliana*.
  • Integration of substrate data with regulatory modification mechanisms.

Main Results:

  • A systematic classification of SnRK2 substrates and their mechanistic roles in stress signaling and development is presented.
  • SnRK2 undergoes diverse PTMs, including phosphorylation, ubiquitination, SUMOylation, S-nitrosylation, sulfation, and N-glycosylation.
  • These PTMs fine-tune SnRK2's stability, activity, and localization, creating a feedback system for kinase regulation.

Conclusions:

  • SnRK2 acts as both a phosphorylation effector and a PTM-regulated scaffold in plant stress responses.
  • Understanding SnRK2 substrate networks and regulatory PTMs offers novel avenues for enhancing crop resilience.
  • Targeted manipulation of SnRK2 signaling modules holds potential for developing climate-resilient agriculture.