title: Procedure for the simultaneous large-scale isolation of pullulanase and 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae involving liquid-liquid separations.
abstract: A procedure for the simultaneous large-scale isolation of pullulanase and 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae is described. The pullulanase is solubilized from the cell wall by cholate treatment; cells and cell debris are removed by partition in a poly(ethylene glycol) (PEG)-dextran two-phase system and from the upper (PEG) phase of this system the pullulanase is isolated by ultrafiltration and precipitation with N-cetyl,N-,N-,N-trimethyl ammonium bromide to a purity of about 80% with a yield of 70%. The preparations are free of alpha-amylase activity. The cell containing dextran-rich phase is passed through a Manton-Gaulin homogenizer. Then the phosphorylase is separated from the cell debris by partition in a second PEG-dextran system. From the top phase of this system the phosphorylase is isolated by distribution in a PEG-salt two-phase system followed by batch adsorption on carboxymethyl-Sephadex in a yield of 55%, a purity of around 90%, and nearly free of glycosyltransferase activity. All steps in the isolation of the two enzymes can be performed easily in a large scale.
mesh_terms: D002458:Cell Fractionation / Q000379:methods*; D011232:Chemical Precipitation; D002850:Chromatography, Gel; D004589:Electrophoresis, Disc; D005374:Filtration; D006026:Glycoside Hydrolases / Q000302:isolation & purification* / Q000378:metabolism; D007711:Klebsiella pneumoniae / Q000032:analysis / Q000201:enzymology*; D006005:Phosphorylases / Q000302:isolation & purification* / Q000378:metabolism; D011506:Proteins / Q000032:analysis; D012967:Sodium Dodecyl Sulfate
chemical_list: D011506:Proteins; D012967:Sodium Dodecyl Sulfate; D006005:Phosphorylases; D006026:Glycoside Hydrolases