title: Partial purification and properties of glucosyltransferase from Streptomyces aureofaciens.
abstract: Differential centrifugation, precipitation with ammonium sulphate and chromatography on DEAE-cellulose led to a twenty-fold purification of glucosyltransferase from Streptomyces aureofaciens B 96. The Michaelis constants for glucosyluridyl diphosphate (UDP-glucose) was 10.8 microM for 1,2-dihydroxy-9,10-anthraquinone (alizarin) 110 microM; the maximum rate of glucosylation reaction was 5.32 mumol per s per mg protein. The pH optimum was at 7.1; the flat temperature optimum was at 30 degrees C. Using some hydroxy derivatives of 9,10-anthraquinone it was found that the production of glucosides from aglycones with alpha-hydroxyl groups was about 1/8 of the values obtained with beta-hydroxyl substrates. In both types of aglycones the presence of another hydroxyl group led to a higher glucoside production.
mesh_terms: D000880:Anthraquinones; D005960:Glucosides; D005964:Glucosyltransferases / Q000302:isolation & purification* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D013304:Streptomyces aureofaciens / Q000201:enzymology*; D013696:Temperature; D014532:Uridine Diphosphate Glucose
chemical_list: D000880:Anthraquinones; D005960:Glucosides; D005964:Glucosyltransferases; D014532:Uridine Diphosphate Glucose