Heme Dependent Catalase Conditionally Contributes to Oxygen Tolerance of Tetragenococcus halophilus Strains Isolated from Soy Sauce Moromi

Tetragenococcus halophilus strains are the halophilic lactic acid bacteria (LAB) that present in microbial communities during soy sauce or other hyperosmotic foods’ fermentation. This species contributes to formation of volatiles fermented foods but may experience harsh conditions such as oxidative stress and osmotic The characterization oxygen tolerance T. elaboration its antioxidant mechanism important for selection suitable LAB food In this work, growth isolated from moromi under both aerobic anaerobic was compared, function their enzymes investigated. These showed differences oxidation resistance, they all produce including superoxide dismutase, peroxidase glutathione reductase. Interestingly, genes encoding catalase (CAT) genome strains, though some them pseudogenes. Catalase produced by belongs heme-dependent CAT, activity could only be detected presence heme condition. CAT conditionally resistance hydrogen peroxide stress. results elucidated possible revealed strains.