[Riboflavin transport in mutant of Pichia guilliermondii yeast with damaged glucose uptake].

The mutant of P. guilliermondii yeast MS-50 which had lost the ability to grow in a glucose-containing medium but not in the presence of sucrose or maltose was selected. The mutant has a damaged glucose uptake from the medium. The riboflavin permease activity of the MS1-50 mutant is not impaired; glucose inhibits the riboflavin uptake by this strain. Thus, riboflavin permease does not promote glucose transport into yeast cells.