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Related Experiment Videos

Vertebrate and yeast calmodulin, despite significant sequence divergence, are functionally interchangeable.

T N Davis1, J Thorner

  • 1Department of Biochemistry, University of California, Berkeley 94720.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1989
PubMed
Summary
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Vertebrate calmodulin can replace yeast calmodulin, demonstrating conserved essential functions and similar protein structures between species. This finding advances understanding of intracellular calcium signaling roles.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Calmodulin is a crucial calcium-binding protein involved in diverse cellular processes.
  • Understanding calmodulin's conserved functions across eukaryotes is key to deciphering intracellular calcium signaling.

Purpose of the Study:

  • To investigate the functional conservation of calmodulin between yeast and vertebrates.
  • To determine if Xenopus laevis calmodulin can substitute for endogenous yeast calmodulin.
  • To explore structural similarities and functional roles of calmodulin in different eukaryotes.

Main Methods:

  • Yeast strains were engineered to express Xenopus laevis calmodulin under a GAL1 promoter.
  • Growth rates and essential cellular functions (microtubule distribution, secretion, etc.) were compared between yeast and vertebrate calmodulin-expressing strains.

Related Experiment Videos

  • Calmodulin overproduction effects and drug resistance (trifluoperazine) were assessed.

    • Main Results:

    • Yeast strains expressing only Xenopus laevis calmodulin exhibited growth rates comparable to those with endogenous calmodulin.
    • Functional substitution was successful despite significant amino acid differences (60/148), indicating conserved protein conformations.
    • Overproduction of either calmodulin type did not alter key cellular characteristics or confer drug resistance.

    Conclusions:

    • Calmodulin's essential functions are highly conserved between yeast and vertebrates.
    • The study supports overlapping roles for calmodulin in intracellular calcium signaling across diverse eukaryotic organisms.
    • Structural adaptability allows functional equivalence despite evolutionary divergence.