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Identification of mannitol in Geotrichum candidum Link and the mechanism of its formation



Identification of mannitol in Geotrichum candidum Link and the mechanism of its formation



Acta Biochim Biophys Sinica 3(3): 247-255



A large amount of polyol was found in the mycelium of G. candidum and identified as mannitol by paper chromatography, paper electrophoresis and melting-point determinations of the recrystallized polyol and its tetraacetate derivative. A NADP-specific mannitol dehydrogenase was found in the cell-free extracts of G. candidum; it catalyzed the oxidation of mannitol to fructose by NADP. The reaction was reversible. A phosphatase (or phosphatases) catalyzing the hydrolysis of fructose phosphate esters to free fructose and inorganic phosphate was also found in the cell-free extracts. No NAD(P)H2-fructose- 6-phosphate-reductase activity was detected in the cell-free extracts. The pathway of mannitol formation in G. candidum was established as: [image] In xylose-grown mycelium of G. candidum a NAD-specific L-iditol dehydrogenase was adaptively formed; it catalyzed the following reactions: [image].

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