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Related Experiment Videos

Protein phosphorylation during coconut zygotic embryo development

Islas-Flores1, Oropeza, Hernandez-Sotomayor

  • 1Unidad de Biologia Experimental, Centro de Investigacion Cientifica de Yucatan, Apdo. Postal 87, Cordemex, Yucatan 97310, Mexico.

Plant Physiology
|September 11, 1998
PubMed
Summary

Protein kinases, including threonine, serine, and tyrosine (Tyr) kinases, are present in developing coconut embryos. These enzymes may coordinate coconut embryo development through protein phosphorylation.

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Area of Science:

  • Plant Molecular Biology
  • Biochemistry
  • Developmental Biology

Background:

  • Protein kinases regulate cellular processes through phosphorylation.
  • Tyrosine (Tyr) kinases are crucial in cell signaling and development.
  • Coconut (Cocos nucifera L.) zygotic embryos offer a model for studying plant embryogenesis.

Purpose of the Study:

  • To investigate the presence and activity of protein threonine, serine, and Tyr kinases in developing coconut zygotic embryos.
  • To determine the potential role of protein phosphorylation, particularly Tyr phosphorylation, in coconut embryo development.

Main Methods:

  • In vitro protein phosphorylation assays using [gamma-32P]ATP.
  • Thin-layer chromatography analysis of phosphorylated amino acids.

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  • Western blotting with antiphosphotyrosine monoclonal antibodies.
  • Enzyme activity assays using a specific Tyr kinase peptide substrate (RR-SRC).
  • Inhibition studies using genistein, a Tyr kinase inhibitor.

    • Main Results:

    • Evidence for threonine, serine, and Tyr kinase activity in coconut embryos.
    • Detection of phosphoserine, phosphothreonine, and phosphotyrosine in embryo protein hydrolysates.
    • Dynamic changes in Tyr-phosphorylated protein profiles during embryo development.
    • Two distinct peaks of Tyr kinase activity observed during early and late embryogenesis.
    • Genistein inhibited Tyr kinase activity, confirming its role.

    Conclusions:

    • Developing coconut zygotic embryos possess threonine, serine, and Tyr kinases.
    • Protein phosphorylation, especially Tyr phosphorylation, likely plays a role in coordinating coconut embryo development.