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Regulation Of Catalase Synthesis In Salmonella Typhimurium.

G. Finn, S. Condon
Published 1975 · Biology, Medicine

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The specific activity of catalase in Salmonella typhimurium and other enteric bacteria decreased during the logarithmic phase of growth and increased at the onset and during the stationary phase. The increase in catalase synthesis at the end of the exponential phase in S. typhimurium cells coincided with the lowest pH value reached by the culture. Maintenance of the pH at a constant neutral value did not alter the typical pattern of synthesis in contradiction of the results previously reported (McCarthy and Hinshelwood. 1959). A sudden decrease in the pH value of an S. typhimurium culture during exponential growth by addition of HC1 did not cause an alteration in the catalase synthesis pattern. Addition of hydrogen peroxide to S. typhimurium cultures within the range 1 muM TO 2MM during the exponential growth phase stimulated catalase synthesis. The extent of catalase synthesis depended on the concentration of hydrogen peroxide; the maximum stimulation was observed at 80 muM. Increased catalase synthesis was not detected for 10 to 15 min after hydrogen peroxide addition. Hydrogen peroxide was produced by S. typhimurium cultures during the exponential and stationary growth phases. However, no direct relationship between hydrogen peroxide accumulation and synthesis of catalase was observed.

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