The Mechanism of Metabolism of Glycosylsucrose with a Cariogenic <I>Streptococcus mutans</I>
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概要
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Glucosylsucrose (G<SUB>2</SUB>F) and maltosylsucrose (G<SUB>3</SUB>F) are principal constitutents of coupling sugar which is prepared from starch and sucrose. Coupling sugar has a similar taste to cane sugar and is used as a sugar substitute to reduce the incidence of dental caries in man. <I>Streptococcus mutans</I> produces a large amount of acids and insoluble glucan from sucrose so that it is considered to play an important role in the initiation of dental caries. However, resting cells grown in the medium containing glucose, sucrose, or maltose produced little amount of acid and no insoluble glucan from these sugar substitute. To clarify the mechanism of G<SUB>2</SUB>F and G<SUB>3</SUB>F metabolism in <I>S. mutans</I> strain GS 5, the cells were cultured in G<SUB>2</SUB>F and G<SUB>3</SUB>F.<BR>When the cells were incubated in the presence of coupling sugar, G<SUB>2</SUB>F or G<SUB>3</SUB>F as a only carbon source, they adapted to these sugar substitute after a long time (72-100hr). The adapted cells produced a large amount of acid from G<SUB>2</SUB>F as well as from glucose or sucrose but did not produce insoluble glucan. This is explained by the findings that growth in G<SUB>2</SUB>F medium resulted in the induction of G<SUB>2</SUB>F-phosphoenolpyruvate dependent phosphotransferace system and of maltase in the soluble fraction in these cells.
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