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Three homofermentative (Lactobacillus plantarum B38,L. plantarum B33,Pediococcus pentosaceus B30) and three heterofermentative (Leuconostoc mesenteroides 39, L. oenos B70,Lactobacillus brevis ) lactic acid bacteria were examined for the presence or absence of nicotinamide adenine dinucleotide (NAD)-dependent and NAD-independentd - andl -lactate dehydrogenases. Two of the six strains investigated,P. pentosaceus andL. oenos , did not exhibit an NAD-independent enzyme activity capable of reducing dichlorophenol indophenol. Thep H optima of the lactic dehydrogenases were determined. The NAD-dependent enzymes from homofermentative strains exhibited optima atp H 7.8 to 8.8, whereas values from 9.0 to 10.0 were noted for these enzymes from heterofermentative organisms. The optima for the NAD-independent enzymes were between 5.8 and 6.6. The apparent Michaelis-Menten constants determined for both NAD and the substrates demonstrated the existence of a greater affinity ford - thanl -lactic acid. A comparison of the specific NAD-dependent and NAD-independent lactate dehydrogenase activities revealed a direct correlation of thed/l ratios of these activities with the type of lactic acid produced during the growth of the organism.

journal of bacteriology

Nicotinamide Adenine Dinucleotide-Dependent and Nicotinamide Adenine Dinucleotide-Independent Lactate Dehydrogenases in Homofermentative and Heterofermentative Lactic Acid Bacteria