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Related Experiment Videos

Minimal CK2 activity required for yeast growth.

German H Hermosilla1, Julio C Tapia, Jorge E Allende

  • 1Programa de Microbiología y Micología, ICBM, Facultad de Medicina, Universidad de Chile, Independencia 1027, Santiago, Chile.

Molecular and Cellular Biochemistry
|December 13, 2005
PubMed
Summary

Protein kinase CK2 is vital for yeast growth. Truncated CK2alpha mutants from Xenopus laevis showed varying abilities to complement yeast lacking functional CK2 genes, with shorter versions losing essential activity.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Yeast Genetics

Background:

  • Protein kinase CK2 is crucial for Saccharomyces cerevisiae growth.
  • Yeast cells deficient in CK2 catalytic subunits require external cDNA for survival.
  • CK2alpha from Xenopus laevis serves as a model for studying enzyme function.

Purpose of the Study:

  • To investigate the functional domains of Xenopus laevis CK2alpha.
  • To determine the minimal sequence required for CK2alpha activity in vivo.
  • To correlate in vitro catalytic activity with in vivo complementation in yeast.

Main Methods:

  • Construction and expression of carboxyl-terminal deletion mutants of Xenopus laevis CK2alpha in yeast.
  • Complementation assays in yeast mutant RPG41-1a (defective in CKA1 and CKA2).

Related Experiment Videos

  • In vitro kinase assays to measure casein phosphorylation activity of CK2alpha mutants.

    • Main Results:

    • Wild-type and longer CK2alpha mutants (1-328, 1-327) effectively complemented yeast growth.
    • A mutant with 1-326 amino acids showed significantly diminished growth and 0.6% of wild-type catalytic activity.
    • Mutants with 1-324 and 1-323 amino acids were unable to support yeast growth.
    • The 1-326 mutant exhibited temperature sensitivity and increased UV sensitivity.

    Conclusions:

    • The carboxyl terminus of Xenopus laevis CK2alpha is critical for its catalytic activity and essential function in yeast.
    • Specific amino acid residues within the C-terminal region are indispensable for maintaining CK2alpha's role in cell growth.
    • CK2alpha's function is sensitive to structural integrity, impacting its kinase activity and cellular roles.