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Choline kinase from yeast

S Yamashita1, K Hosaka

  • 1Department of Biochemistry, Gunma University School of Medicine, Maebashi, Japan. sayamash@sb.gunma-u.ac.jp

Biochimica Et Biophysica Acta
|November 25, 1997
PubMed
Summary
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Yeast choline kinase (CKI) initiates key pathways for phospholipid synthesis. Its gene expression is tightly regulated by myo-inositol and choline levels in yeast cells.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Yeast Genetics

Background:

  • Choline kinase is a crucial enzyme initiating the CDP-choline and CDP-ethanolamine pathways.
  • These pathways are essential for synthesizing phosphatidylcholine and phosphatidylethanolamine, vital cell membrane components.
  • Understanding choline kinase regulation is key to comprehending phospholipid metabolism.

Purpose of the Study:

  • To clone and characterize the yeast choline kinase gene (CKI).
  • To determine the protein sequence and potential functional domains of yeast choline kinase.
  • To investigate the regulatory mechanisms controlling yeast choline kinase expression.

Main Methods:

  • Genetic complementation of a choline kinase mutation (cki) to clone the CKI gene.

Related Experiment Videos

  • DNA sequencing to determine the deduced amino acid sequence of the enzyme.
  • Analysis of gene expression patterns under different nutrient conditions (myo-inositol and choline).

    • Main Results:

    • The yeast choline kinase gene (CKI) was successfully cloned.
    • The deduced protein sequence revealed 582 amino acid residues and a molecular mass of 66,316 Da.
    • Sequence similarity was found with protein kinases and bacterial antibiotic phosphotransferases.
    • Yeast choline kinase expression is coordinately repressed by myo-inositol and choline.

    Conclusions:

    • The CKI gene encodes yeast choline kinase, a key enzyme in phospholipid biosynthesis.
    • Yeast choline kinase shares structural similarities with other phosphotransferases.
    • Enzyme expression is tightly regulated by phospholipid precursors, indicating a feedback control mechanism.