Reference: Krakenaite RP and Glemzha AA (1983) [Some properties of two forms of alpha-glucosidase from Saccharomyces cerevisiae-II] Biokhimiia 48(1):62-8

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Abstract


The amino acid composition of two forms of alpha-glucosidase from the yeast Saccharomyces cerevisiae-II was established and the values of Km, V, kcat and kcat/Km for maltose, maltotriose and p-nitrophenyl-alpha-D-glucopyranoside (PNPG) were determined. PNPG possessed a much higher affinity for the enzyme as compared to sucrose, maltose and maltotriose. The value of V decreased in the following order: PNPG greater than sucrose greater than maltose greater than greater than maltotriose. No differences between the kinetic parameters of individual forms of alpha-glucosidase were observed. Glucose, fructose and methyl-alpha-glucoside act as competitive inhibitors. The two forms of alpha-glucosidase under study have an identical pH optimum and thermal stability.

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Journal Article
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Krakenaite RP, Glemzha AA
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