EC 5.3.1.8 From E. coli. This recombinant enzyme has been expressed in E. coli and purified by affinity chromatography. Electrophoretically homogeneous (MW 43,900). In 3.2 M ammonium sulphate. Specific activity: 98 U/mg (25°C, pH 7.6, on mannose 6-phosphate). Contaminants: Phosphoglucose Isomerase < 0.03%; hexokinase 0.03%; glucose 6-phosphate dehydrogenase < 0.001%. Stable at 4°C for > 4 years.