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Related Experiment Videos

Yeast calmodulin: structural and functional elements essential for the cell cycle.

Y Ohya1, Y Anraku

  • 1Department of Biology, Faculty of Science, University of Tokyo, Japan.

Cell Calcium
|June 1, 1992
PubMed
Summary
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Budding yeast calmodulin is essential for cell proliferation, nuclear division, and cell polarity. Vertebrate calmodulin can replace yeast calmodulin, and half the molecule suffices for growth, indicating key functional domains.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The budding yeast Saccharomyces cerevisiae is a model organism for studying fundamental cellular processes.
  • Calmodulin (CaM) is a crucial calcium-binding protein involved in diverse cellular functions across eukaryotes.
  • Understanding CaM's role in yeast provides insights into conserved mechanisms in higher organisms.

Purpose of the Study:

  • To investigate the essential functions of calmodulin in Saccharomyces cerevisiae cell proliferation.
  • To determine if vertebrate calmodulin can substitute for yeast calmodulin.
  • To identify cell cycle events and target proteins regulated by yeast calmodulin.

Main Methods:

  • Genetic analysis of yeast calmodulin mutants.
  • Functional complementation studies using vertebrate calmodulin.

Related Experiment Videos

  • Cellular localization studies of calmodulin.
  • Biochemical assays to identify calmodulin-regulated enzymes.

    • Main Results:

    • Vertebrate calmodulin functionally complements yeast calmodulin.
    • Expression of half the yeast calmodulin molecule is sufficient for cell growth.
    • Calmodulin is required for nuclear division and maintenance of cell polarity.
    • Three yeast enzymes regulated by calmodulin have been identified.

    Conclusions:

    • Calmodulin plays indispensable roles in yeast cell cycle progression and morphogenesis.
    • The conserved nature of calmodulin function allows for cross-species complementation.
    • Identifying calmodulin's target proteins is key to elucidating its essential cellular roles.