Regulation of Synthesis of -Fructofuranosidase (Invertase) in Streptococcus mitis

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Abstract
.beta.-Fructofuranosidase activity was cell-bound in S. mitis ATCC 903. The following evidence suggests that induction functions as a regulatory mechanism for .beta.-fructofuranosidase in S. mitis: on transfer of glucose-grown exponential phase bacteria to sucrose medium, the specific activity of .beta.-fructofuranosidase increased 4-fold in the course of 1 generation; other sugars had no stimulatory effect on the rate of synthesis of .beta.-fructofuranosidase; the effect of sucrose on the rate of synthesis of .beta.-fructofuranosidase could be measured within a few minutes. Glucose, fructose and mannose repressed .beta.-fructofuranosidase. The addition of glucose to bacteria growing on sucrose repressed .beta.-fructofuranosidase for about 1 generation. The intracellular concentration of glucose was considerably increased during repression, while the intracellular concentrations of glycolytic intermediates did not vary significantly.

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