抄録
In order to investigate the configuration of the new galactose compound of riboflavin, its effects on the enzymatic action of Aspergillus oryzae, including transglycosidation, oxidation of galactose, malic dehydrogenation and malic enzyme system were compared with those of riboflavinylglucoside. (1) Similarly to riboflavinylglucoside, the new galactose compound accelerated transglycosidation with the following steps : Gl (4-1) Ga+B_2→B_2-Ga+Gl B_2-Ga+Gl→B_2-Ga(6-1)Gl→B_2+Ga(6-1)Gl B_2-Ga + Ga→B_2-Ga(6-1)Ga→B_2+Ga(6-1)Ga B_2-Ga+Gl(4-1)Ga→B_2-Ga(6-1)Gl(4-1)Ga→B_2+Ga(6-1)Gl(4-1)Ga, and the following reaction was proved to be rea1ized ; B_2-Ga+Gl⇄B_2-Gl+Ga (2) The new galactose compound also accelerated malic dehydrogenation, but it inhibited the oxidation of galactose and action of malic enzyme of the mould, as was the case with riboflavinylglucoside. It may therefore be concluded that the same glycosidic linkage as exists in riboflavinylglucoside is contained in the new galactose compound. Moreover it was suggested that these flavinylglycosides would play a significant role in keeping the equilibrium between glycolysis and oxidation of hexoses.
