1.14.11.48 15 30 xanthine 30°C, pH 7.4, value depending on preparation, enzyme isolated from Aspergillus nidulans 731289 1.14.11.48 32 - xanthine pH 7.4, 25°C, mutant enzyme C357A 731217 1.14.11.48 34 - xanthine pH 7.4, 25°C, mutant enzyme D138A 731217 1.14.11.48 35 - xanthine pH 7.4, 25°C, mutant enzyme Q356A 731217 1.14.11.48 38 - xanthine pH 7.4, 25°C, mutant enzyme N358A 731217 1.14.11.48 40 - xanthine pH 7.4, 25°C, mutant enzyme E137A 731217 1.14.11.48 60 - xanthine pH 7.4, 25°C, mutant enzyme K122A 731217 1.14.11.48 71.4 - xanthine 25°C, pH 7.4, recombinant enzyme isolated from Escherichia coli 731289 1.14.11.48 72 - xanthine pH 7.4, 25°C, wild-type enzyme 731217