title: Purification of the catalytic subunit of protein phosphatase-1 from Drosophila melanogaster.
abstract: The catalytic subunit of phosphatase-1 has been purified from Drosophila melanogaster by precipitation with (NH4)2SO4 and ethanol, by affinity chromatography on heparin-Sepharose and by fast protein liquid chromatography on Mono Q beads. The preparation is homogeneous as tested by SDS gel electrophoresis and has a molecular mass of 33,000. The phosphatase specifically dephosphorylates the beta subunit of phosphorylase kinase. Its phosphorylase phosphatase activity is inhibited by inhibitor-1, inhibitor-2, protamine and histone H2B while is stimulated by histone H1.
mesh_terms: D000818:Animals; D004331:Drosophila melanogaster / Q000201:enzymology*; D007700:Kinetics; D046911:Macromolecular Substances; D008970:Molecular Weight; D010749:Phosphoprotein Phosphatases / Q000302:isolation & purification* / Q000378:metabolism; D054645:Protein Phosphatase 1; D013379:Substrate Specificity
chemical_list: D046911:Macromolecular Substances; D010749:Phosphoprotein Phosphatases; D054645:Protein Phosphatase 1