Comparative Studies on Glycogen Phosphorylase
نویسندگان
چکیده
منابع مشابه
Comparative Studies on Glycogen Phosphorylase
The isolation and crystallization of both forms of glycogen phosphorylase from human skeletal muscle (1) have made possible a detailed study of the properties of these enzymes in comparison with those of rabbit skeletal muscle (2, 3). Phosphorylase b and a from both species have been shown to crystallize under similar conditions and to have similar pH optima, electrophoretic mobilities, sedimen...
متن کاملLiver Glycogen Phosphorylase Kinase
Liver glycogen phosphorylase kinase was assayed by measuring the radioactivity of [y-32P]ATP incorporated into rabbit skeletal muscle phosphorylase b. Using this assay two forms of phosphorylase kinase, Kinase I and Kinase II, were pirified about 70and 130-fold, respectively, from rabbit liver cytosol by DEAE-Sephadex A50 column chromatography, ammonium sulfate fractionation, gel filtration on ...
متن کاملMolecular studies of glycogen phosphorylase b from bovine liver.
Two active isoforms of bovine liver phosphorylase with distinct subunit composition have previously been purified (Cámara Artigas, A., Barón, C. and Parody-Morreale, A. Prot. Express. Purif. 1994, 5, 157), one showing three SDS-PAGE polypeptide bands (molecular mass = 97, 55 and 40 kDa) and the other showing just one (molecular mass = 97 kDa). A molecular mass of 200 kDa has been determined for...
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The glycogen phosphorylase of Dictyostelium discoideum has been purified over 200-fold from cells in the culmination stage of development. Analytical gel electrophoresis of the purified enzyme indicates one major protein band with a molecular weight of approximately 210,000. Gel elution verified the presence of phosphorylase activity associated with the protein band. Electrophoresis of partiall...
متن کاملORDERED MECHANISM OF BINDING OF PHOSPHORYLASE KINASE AND GLYCOGEN PHOSPHORYLASE b TO GLYCOGEN
The kinetics of the interaction of rabbit skeletal muscle phosphorylase kinase with glycogen has been studied using turbidimetric method (40 mM Hepes, pH 6.8, and 8.2; 20◦C). The binding of phosphorylase kinase with glycogen occurs only in the presence of Ca and Mg . According to the kinetic data, phosphorylase b favors the binding of phosphorylase kinase with glycogen. This conclusion is suppo...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1963
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)81188-7