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    Proc Natl Acad Sci U S A. 1989 Mar;86(5):1443-7.

    Human muscle glycogen synthase cDNA sequence: a negatively charged protein with an asymmetric charge distribution.

    Browner MF, Nakano K, Bang AG, Fletterick RJ.

    Source

    Department of Biochemistry, University of California, San Francisco 94143.

    Abstract

    The cDNA for human muscle glycogen synthase encodes a protein of 737 amino acids. The primary structure of glycogen synthase is not related either to bacterial glycogen synthase or to any glycogen phosphorylase. All nine of the serines that are phosphorylated in the rabbit muscle enzyme in vivo are conserved in the human muscle sequence. The amino- and carboxyl-terminal fragments, which contain all the phosphorylation sites, are very negatively charged. Overall the unphosphorylated protein has a charge of -13, while the fully phosphorylated inactive protein has a net charge of -31. The importance of the asymmetrical charge distribution is discussed.

    PMID:
    2493642
    [PubMed - indexed for MEDLINE]
    PMCID: PMC286712
    Free PMC Article

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