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  • Title: Cryptococcal UDP-glucose dehydrogenase: enzymic control of capsular biosynthesis.
    Author: Jacobson ES.
    Journal: J Med Vet Mycol; 1987 Jun; 25(3):131-5. PubMed ID: 3302196.
    Abstract:
    UDP-Glucuronate, formed through dehydrogenation of UDP-glucose and itself decarboxylated to make UDP-xylose, is the presumed donor for the glucuronyl side-groups in biosynthesis of the capsular polysaccharide in Cryptococcus neoformans. A specific radiochromatographic assay for UDP-glucose dehydrogenase shows that the enzyme is present in the cytosol. The enzyme is very labile but is stabilized by 25% glycerol. The enzyme is inhibited strongly by NADH (Ki,NADH = Km,NAD = 0.1 to 0.2 mM). It is also inhibited competitively by UDP-xylose (Ki = 0.3 mM). These results suggest that the rate of production of the capsular precursor, UDP-glucuronate, is controlled by the intracellular concentrations of an end product, UDP-xylose, and of a direct product, NADH. Capsule mutants have been screened for activity of this enzyme but none is clearly deficient.
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