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Related Experiment Video

Updated: Mar 19, 2026

A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses
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Protein Kinases from Soybean and Rice Leaves.

H Karibe1, S Komatsu1

  • 1a Department of Molecular Biology , National Institute of Agrobiological Resources , 2-1-2 Kannondai, Tsukuba, Ibaraki 305 , Japan.

Bioscience, Biotechnology, and Biochemistry
|June 15, 2016
PubMed
Summary

Researchers purified two plant protein kinases from soybeans and rice. These enzymes, activated by calcium and phosphatidylserine, catalyze histone phosphorylation.

Area of Science:

  • Biochemistry
  • Plant Molecular Biology
  • Enzymology

Background:

  • Protein kinases play crucial roles in cellular signaling pathways.
  • Understanding plant-specific protein kinases is essential for deciphering crop physiology.
  • Calcium and phosphatidylserine are known modulators of various cellular processes.

Purpose of the Study:

  • To partially purify and characterize protein kinases from soybean and rice.
  • To investigate the activators and substrate specificity of these plant protein kinases.

Main Methods:

  • Sequential chromatography was employed for partial purification of protein kinases.
  • Enzyme activity assays were performed to determine kinase function.
  • Molecular masses were estimated using standard biochemical techniques.
Keywords:
protein kinasericesoybean

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Main Results:

  • Two distinct protein kinases were purified, with molecular masses of 47 kDa (soybean) and 50 kDa (rice).
  • Both enzymes demonstrated activation by calcium and phosphatidylserine.
  • The purified kinases catalyzed the phosphorylation of serine residue(s) in histone III-S.

Conclusions:

  • Soybean and rice possess distinct calcium- and phosphatidylserine-activated protein kinases.
  • These kinases phosphorylate histone proteins, suggesting a role in gene regulation or related processes.
  • Further research is warranted to elucidate the specific biological functions of these plant enzymes.