A new variety of Aureobasidium pullulans characterized by exopolysaccharide structure, nutritional physiology and molecular features |
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Authors: | N.A. Yurlova G.S. de Hoog |
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Affiliation: | (1) Department of Microbiology, Chemical-Pharmaceutical Institute, 14, Prof. Popov Str., 197376 St. Petersburg, Russia;(2) Centraalbureau voor Schimmelcultures, P.O. Box 273, 3740 Ag Baarn, the Netherlands |
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Abstract: | The black yeast Aureobasidium pullulans (de Bary) Arnaud is known to synthesize the exopolysaccharide pullulan, a poly- -1,6-maltotriose. Nine strains were found to produce additional aubasidan-like EPS, i.e. glucans with -1,4-D-, -1,6-D- and -1,3-D-glycosidic bonds. These strains had previously been found to deviate in genotypic characters. Additional physiological differences were found: the optimal nitrogen source for exopolysaccharide production in liquid medium was NaNO3 for aubasidan-producing strains, and (NH4)2SO4 for the remaining strains. A new variety, A. pullulans var. aubasidani Yurlova, is described for the strains producing aubasidan-like components. The new variety can be distinguished from A. pullulans var. pullulans by the absence of assimilation of methyl- -D-glucoside and lactose. |
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Keywords: | Aureobasidium pullulans black yeasts exopolysaccharides taxonomy |
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