J. Bacteriol., Dec 1996, 7311-7315, Vol 178, No. 24
Copyright © 1996, American Society for Microbiology

13C nuclear magnetic resonance analysis of glucose and citrate end products in an ldhL-ldhD double-knockout strain of Lactobacillus plantarum

T Ferain, AN Schanck and J Delcour
Laboratoire de Genetique Moleculaire, Unite de Genetique, Universite Catholique de Louvain, Louvain-la-Neuve, Belgium.

We have examined the metabolic consequences of knocking out the two ldh genes in Lactobacillus plantarum using 13C nuclear magnetic resonance. Unlike its wild-type isogenic progenitor, which produced lactate as the major metabolite under all conditions tested, ldh null strain TF103 mainly produced acetoin. A variety of secondary end products were also found, including organic acids (acetate, succinate, pyruvate, and lactate), ethanol, 2,3-butanediol, and mannitol.

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