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Purification and Properties of Glucosaminephosphate Isomerase of Proteus mirabilis

Abstract A glucosamine-P isomerase has been identified in Proteus mirabilis. The 113-fold purified enzyme exhibits a pH optimum of 7.5 with a secondary maximum at 8.5 and a temperature optimum at 37 °C. The apparent Km was 13.3 mᴍ for fructose-6-P and 18.8 mᴍ for ʟ-glutamine. Molecular weight of the enzyme has been estimated as 120000 and the protein can be dissociated in four subunits by SDS-polyacrylamide electrophoresis.