Abstract.
In this study, the responses of two Lactobacillus sake strains to elevated oxygen concentrations at 8 °C were investigated. L. sake DSM 6333 (L. sake sens), unlike L. sake NCFB 2813 (L. sake ins), showed a low growth rate in the presence of 90% O2 and a rapid loss in viability shortly after entry into stationary phase. The steady-state cytosolic superoxide radical (O2 –) concentration in L. sake sens was 0.134 µM and in the oxygen-insensitive mutant LSUV4 it was 0.013 µM. The nine- to ten-fold decrease in the rate of O2 – elimination in L. sake sens indicates the significance of the O2 – -scavenging system in protecting against elevated O2. The superoxide dismutase (SOD) activity was 10- to 20-fold higher in L. sake ins than in L. sake sens, depending on the growth phase. An oxygen-insensitive mutant of L. sake sens, designated as strain LSUV4, had a ten-fold higher SOD activity than the wild-type strain, which likely restored its oxygen tolerance. Damage to proteins in L. sake sens was evidenced by the increased protein carbonyl content and reduced activities of the [Fe-S]-cluster-containing enzymes fumarase and fumarate reductase. This study forms a physiological basis for understanding the significance of elevated oxygen stress as an additional method for inhibition of microbial growth in relation to food preservation.
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Amanatidou, A., Bennik, M.H., Gorris, L.G. et al. Superoxide dismutase plays an important role in the survival of Lactobacillus sake upon exposure to elevated oxygen. Arch Microbiol 176, 79–88 (2001). https://doi.org/10.1007/s002030100297
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DOI: https://doi.org/10.1007/s002030100297