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Lactococcus lactis is used in food and biotechnology industries for its capacity to produce lactic acid, aroma, and proteins. This species grows by fermentation or by an aerobic respiration metabolism when heme is added. Whereas fermentation leads mostly to lactic acid production, respiration produces acetate and acetoin. Respiration growth leads to greatly improved bacterial growth and survival. Our study aims at deciphering mechanisms of respiration metabolism that have a major impact on bacterial physiology. Our results showed that two metabolic pathways (acetate and acetoin) are key elements of respiration. The acetate pathway contributes to biomass yield. The acetoin pathway is needed for pH homeostasis, which affects metabolic activities and bacterial viability in stationary phase. This study clarifies key metabolic elements that are required to maintain the growth advantage conferred by respiration metabolism and has potential uses in strain optimization for industrial and biomedical applications.

Task Distribution between Acetate and Acetoin Pathways To Prolong Growth in Lactococcus lactis under Respiration Conditions