A new variety of Aureobasidium pullulans characterized by exopolysaccharide structure, nutritional physiology and molecular features.
The black yeast Aureobasidium pullulans (de Bary) Arnaud is known to synthesize the exopolysaccharide pullulan, a poly-alpha-1,6-maltotriose. Nine strains were found to produce additional aubasidan-like EPS, i.e. glucans with alpha-1,4-D-, beta-1,6-D- and beta-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-alpha-D-glucoside and lactose.
Yurlova
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NA
Department of Microbiology, Chemical-Pharmaceutical Institute, St. Petersburg, Russia.
de Hoog
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GS
D000645:Ammonium Sulfate / Q000378:metabolism; D002965:Classification; D003470:Culture Media / Q000378:metabolism; D005936:Glucans / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D007785:Lactose / Q000378:metabolism; D008757:Methylglucosides / Q000378:metabolism; D003904:Mitosporic Fungi / Q000145:classification* / Q000302:isolation & purification / Q000378:metabolism; D009566:Nitrates / Q000378:metabolism; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification
D003470:Culture Media; D005936:Glucans; D008757:Methylglucosides; D009566:Nitrates; D011134:Polysaccharides; C027020:methylglucoside; C031618:sodium nitrate; C009109:pullulan; D007785:Lactose; D000645:Ammonium Sulfate