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Related Experiment Videos

Structure-based systematic isolation of conditional-lethal mutations in the single yeast calmodulin gene

Y Ohya1, D Botstein

  • 1Department of Genetics, Stanford University School of Medicine, California 94305-5120.

Genetics
|December 1, 1994
PubMed
Summary

Researchers created conditional-lethal calmodulin mutants in yeast by altering phenylalanine residues. Most multiple mutations caused growth defects, indicating these residues are crucial for calmodulin function.

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Area of Science:

  • Molecular Biology
  • Cell Biology

Background:

  • Calmodulin (CMD1) is essential in Saccharomyces cerevisiae, but conditional-lethal mutations are hard to isolate.
  • Structural and evolutionary data suggest phenylalanine residues are critical for calmodulin function.

Purpose of the Study:

  • To isolate and characterize conditional-lethal calmodulin mutants by systematically altering phenylalanine residues.
  • To investigate the functional importance of phenylalanine residues in calmodulin.

Main Methods:

  • Constructed seven single and 26 multiple phenylalanine to alanine (Phe-->Ala) mutations in the CMD1 gene.
  • Examined mutant phenotypes in a haploid yeast strain under varying gene copy conditions (single, low, overexpressed).
  • Assessed temperature-sensitive mutations for suppression by CaCl2 and analyzed intragenic complementation in diploid strains.

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Main Results:

  • Most multiple Phe-->Ala mutations, unlike single mutations, caused significant growth phenotypes, including lethality and temperature sensitivity.
  • Overexpression of some mutant genes rescued phenotypes, and some temperature-sensitive mutations were suppressed by CaCl2.
  • Intragenic complementation analysis revealed four complementation groups, suggesting functional redundancy within the calmodulin molecule.

Conclusions:

  • Phenylalanine residues are critical for calmodulin function, with their importance varying based on combination and context.
  • The symmetrical nature of calmodulin may contribute to internal functional redundancy.
  • Systematic alteration of phenylalanine residues is an effective strategy for isolating functional calmodulin mutants.