title: Accumulation of UDP-glucose pyrophosphorylase by axenically grown amoebae of Dictyostelium discoideum.
abstract: Amoebae of the slime mould Dictyostelium discoideum AX2 possess only low UDP-glucose pyrophosphorylase activity when grown on autoclaved Klebsiella aerogenes (approx. 30 units/mg of protein), but accumulate the enzyme to approx. 150-200 units/mg of protein during vegetative growth in axenic medium. The vegetative accumulation of UDP-glucose pyrophosphorylase by axenically grown cells is prevented if autoclaved K. aerogenes are included in the axenic medium, suggesting the absence of a specific inducer. Affinity chromatography using anti-(UDP-glucose pyrophosphorylase) antibody and sodium dodecyl sulphate/polyacrylamide-gel electrophoresis indicate that the enzyme accumulated during axenic growth and that normally accumulated during development are immunologically cross-reactive and that both are composed of two subunits with mol.wts. 55,600 and 57,500 present in approximately equal amounts in the active enzyme.
mesh_terms: D000656:Amoeba / Q000201:enzymology* / Q000254:growth & development; D002846:Chromatography, Affinity; D004023:Dictyostelium / Q000201:enzymology*; D004591:Electrophoresis, Polyacrylamide Gel; D005856:Germ-Free Life; D007700:Kinetics; D009713:Nucleotidyltransferases / Q000378:metabolism*; D005957:UTP-Glucose-1-Phosphate Uridylyltransferase / Q000378:metabolism*
chemical_list: D009713:Nucleotidyltransferases; D005957:UTP-Glucose-1-Phosphate Uridylyltransferase