[Regulation of the activity and synthesis of enzymes participating in the formation of 6,7-dimethyl-8-ribityllumazine, a riboflavin precursor in yeast].

The properties of two flavinogenesis enzymes--synthase of the aliphatic precursor of riboflavin (APR-synthase) and 6.7-dimethyl-8-ribityllumazinesynthase (DMRL-synthase) of Pichia guilliermondii. It is established that DMRL-synthase, uses APR as a substrate which contains, evidently, a phosphate group.