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D-Glucose Isomerase: Constitutive and Catabolite Repression-Resistant Mutants of Streptomyces phaeochromogenes

By Sergio Sanchez and Carmen M. Quinto

Abstract

As in other Streptomyces species, the enzymatic conversion of D-glucose to D-fructose is carried out in Streptomyces phaeochromogenes NRRL B-3559 by the inducible enzyme, D-xylose keto isomerase (EC 5.3.1.5.). Mutants of this microorganism were selected for their ability to grow on D-lyxose (2-epimer of D-xylose). As a result of the mutational event, the microorganism constitutively produced D-xylose isomerase. As in the parent strain, the constitutive formation of the isomerase was repressed by D-glucose. The fact that this mutant was unable to grow in low D-xylose concentrations in the presence of the D-glucose analogue, 3-O-methylglucose, permitted the isolation of D-xylose isomerase constitutive mutants which were insensitive to D-glucose repression

Topics: Metabolism and Products
Year: 1975
OAI identifier: oai:pubmedcentral.nih.gov:187266
Provided by: PubMed Central
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