Purification and Properties of Nicotinamide Adenine Dinucleotide-Dependent d - and l -Lactate Dehydrogenases in a Group N Streptococcus
- 1 August 1972
- journal article
- Published by American Society for Microbiology in Journal of Bacteriology
- Vol. 111 (2), 392-396
- https://doi.org/10.1128/jb.111.2.392-396.1972
Abstract
Streptococcus lactis strain 760, a group N streptococcus, was found to possess nicotinamide adenine dinucleotide-dependent dehydrogenase activities for both the l(+) and the d(−) isomers of lactic acid. The two enzymes were isolated and purified and were found to differ with respect to pH optima, activation by fructose-1,6-diphosphate, pH and heat stability, and the temperature at which each enzyme was formed in the organism during growth. The presence of a racemase for lactic acid was not detected by the methods used.Keywords
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