The Structure of Extracellular Phosphorylated Galactans from Sporobolomyces Yeasts

From the ¹ From the Northern Regional Research Laboratory, Northern Utilization Research and Development Division, United States Department of Agriculture, Peoria, Illinois 61604

Two strains of Sporobolomyces species, NRRL Y-6493 and NRRL Y-6502, produce extracellular, lightly acetylated, phosphorylated galactans when grown on media containing glucose as the carbon source. d-Galactose and d-galactose 6-phosphate were the only carbohydrate components present in strong acid hydrolysates. -d-Galactose 1-phosphate was isolated after vigorous alkaline hydrolysis. Periodate oxidation analyses of intact and deacetylated polymers indicate that approximately equal proportions of -1,6- and -1,3-galactosyl linkages are present. Polymer phosphate occurs exclusively in the form of -d-galactopyranosyl-1-phospho-6'-galactosyl phosphodiester end groups.

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