Abstract
The influence of medium pH on the regulation of glucose catabolism by Lactobacillus plantarum 8014 was examined in anaerobic chemostat cultures. When L. plantarum was grown in a chemostat at pH 5.5, and the pH shifted to pH 7.5, acetate was produced in addition to lactate and acetoin. After the shift, acetate kinase and NAD-dependent lactate dehydrogenase activities increased while the acetoin dehydrogenase and alpha-acetolactate synthase activities decreased. The high acetate kinase activity together with low acetoin dehydrogenase and alpha-acetolactate synthase activities may explain why L. plantarum made more acetate at the expense of acetoin in response to alkaline conditions.
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