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Calmodulin-dependent glycogen synthase kinase.

M E Payne, T R Soderling

    The Journal of Biological Chemistry
    |September 10, 1980
    PubMed
    Summary
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    Researchers discovered a new enzyme, calmodulin-dependent kinase, in rabbit liver that regulates glycogen synthase activity independently of cAMP. This enzyme requires calcium and calmodulin for function, impacting glycogen metabolism.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Glycogen synthase plays a crucial role in glycogen synthesis.
    • Enzyme regulation is vital for metabolic control.
    • Previous research focused on cAMP-dependent regulation of glycogen synthase.

    Purpose of the Study:

    • To identify and characterize novel regulatory mechanisms of glycogen synthase.
    • To investigate the role of calcium and calmodulin in glycogen synthase activity.

    Main Methods:

    • Purification of a novel kinase from rabbit liver.
    • Enzyme activity assays using varying concentrations of calmodulin and Ca2+.
    • Substrate specificity studies using phosphorylase, myosin light chain, casein, and histone.
    • Phosphorylation site mapping on glycogen synthase.

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    Main Results:

    • A cAMP-independent glycogen synthase kinase was purified.
    • The kinase activity was dependent on calmodulin and Ca2+.
    • The enzyme specifically phosphorylated the NH2-terminal domain of glycogen synthase.
    • Phosphorylation led to partial inactivation of glycogen synthase.

    Conclusions:

    • A novel calmodulin-dependent kinase specific for glycogen synthase exists in rabbit liver.
    • This kinase represents a new pathway for regulating glycogen synthesis.
    • Calcium and calmodulin are important regulators of glycogen metabolism.