Abstract
The regulation of product formation and substrate utilization in Streptococcus lactis was studied. In batch culture on glucose or lactose product formation was homolactic whereas heterolactic fermentation occured in continuous culture on glucose. Batch as well as continuous culture on maltose showed a heterolactic fermentation pattern. S. lactis has a metabolic route from pyruvate where formate, acetate and ethanol are the end products. Glucose is shown to cause catabolite repression and inhibition of the enzyme/s/ involved in the metabolism of maltose. However in a carbon-limited chemostat on a mixture of glucose and maltose both sugars were utilized. The results obtained indicate that the rate limiting step in the maltose metabolism is the intracellular splitting of the maltose molecule. The phosphenol-pyruvate-phosphostransferase system does not seem to be involved in the uptake of maltose. The results are discussed in relation to the present knowledge about the regulation of L-lactatedehydrogenase in N-streptococci.
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