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A Survey of the Lactate Dehydrogenase Activities in Group N Streptococci

Authors: R.F. Anders, H.A. Jonas and G.R. Jago


Group N streptococci were found to possess both NAD-dependent and NAD-independent lactate dehydrogenases. The NAD-dependent enzyme, which was specific for the L(+) isomer of lactic acid, was markedly activated by fructose-1,6-diphosphate. Phosphate appeared to inhibit the activation by fructose-1,6-diphosphate. In the complete absence of phosphate or fructose-1,6-diphosphate the enzyme lost activity. The present of NAD-independent enzymes in species of Group N streptococci was variable. These enzymes were not activated by fructose-1,6-diphosphate. Some were specific for the L(+) and others for the D(-) isomers of lactic acid.

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