Effects of H_2O_2 under Low- and High-Aeration-Level Conditions on Growth and Catalase Activity in Exiguobacterium oxidotolerans T-2-2^T(MICROBIAL PHYSIOLOGY AND BIOTECHNOLOGY)

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The effects of H_2O_2 under low- and high-aeration-level conditions on growth and catalase activity in Exiguobacterium oxidotolerans T-2-2^T were investigated. Continuous addition of 5-200mM H_2O_2 to the culture medium from the mid-exponential growth phase enhanced the growth of the strain under the low-aeration-level condition, whereas the addition of 5-50mM H_2O_2 decreased intracellular specific catalase activity and extracellular total catalases activity. The detection of extracellular catalase by the cells and the decrease in intracellular specific catalase activity and extracellular total catalase activity under the high-aeration-level condition account for the stimulation of growth by the introduced H_2O_2 and the decrease in catalase activities induced by O_2 from H_2O_2 in the medium. On the other hand, the addition of H_2O_2 to the medium prior to the initiation of growth inhibited the growth but increased the specific activity of intracellular catalase in the stationary growth phase. Strain T-2-2^T grew when 10mM H_2O_2 was added to the medium prior to growth. However, the growth was completely inhibited by the catalase inhibitor 3-amino-1,2,4-triazole (3-AT). The continuous addition of H_2O_2 at an appropriate concentration from prior to the initiation of growth to the stationary growth phase under the low-aeration-level condition resulted in higher intracellular specific catalase activity and cell growth rate than single H_2O_2 addition prior to growth.
社団法人日本生物工学会の論文
2007-12-25

Effects of H_2O_2 under Low- and High-Aeration-Level Conditions on Growth and Catalase Activity in Exiguobacterium oxidotolerans T-2-2^T(MICROBIAL PHYSIOLOGY AND BIOTECHNOLOGY)

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