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Related Experiment Videos

Polypeptide-dependent protein kinase from bakers' yeast.

Y Yanagita, M Abdel-Ghany, D Raden

    Proceedings of the National Academy of Sciences of the United States of America
    |February 1, 1987
    PubMed
    Summary
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    THE METABOLISM OF THE CENTRAL NERVOUS SYSTEM IN EXPERIMENTAL POLIOMYELITIS.

    The Journal of experimental medicine·2009

    This study purifies a yeast protein serine kinase (PK-P) that requires specific activators and Mg2+ for activity. The enzyme phosphorylates various proteins, including yeast plasma membrane H+-ATPase.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Protein kinases are crucial enzymes regulating cellular processes through phosphorylation.
    • Yeast protein serine kinase (PK-P) was previously uncharacterized, necessitating its purification and property elucidation.
    • Membrane-bound kinases play vital roles in cellular signaling pathways.

    Purpose of the Study:

    • To purify and characterize a novel protein serine kinase (PK-P) from bakers' yeast membranes.
    • To identify the enzyme's requirements for activity, including cofactors and activators.
    • To determine the substrate specificity and potential physiological roles of PK-P.

    Main Methods:

    • Triton X-100 extraction of yeast membranes to isolate PK-P.
    • Enzyme assays using histone or yeast membrane polypeptides and Mg2+ for activation.

    Related Experiment Videos

  • Gel filtration and SDS-PAGE for molecular weight determination and subunit analysis.
  • Phosphorylation assays with various protein substrates, including H+-ATPase.

    • Main Results:

    • PK-P was purified and found to be a heterodimer (Mr 41,000 and 35,000) with an active molecular weight of approximately 75,000.
    • Enzyme activity requires a heat-stable polypeptide activator from yeast membranes and Mg2+; other cations are poorly effective or inhibitory.
    • The smaller subunit (Mr 35,000) is autophosphorylated.
    • PK-P phosphorylates casein, yeast plasma membrane H+-ATPase, mRNA cap-binding proteins, glucocorticoid receptor, and Gi/Go proteins.

    Conclusions:

    • A novel protein serine kinase (PK-P) from yeast membranes has been purified and characterized.
    • PK-P exhibits specific activation requirements and phosphorylates diverse protein substrates, suggesting broad regulatory functions.
    • Further investigation into the natural activator and PK-P's role in yeast physiology is warranted.