Stability and refractoriness of the high catalase activity in the oxidative-stress-resistant fission yeastSchizosaccharomyces pombe |
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Authors: | K Sigler G Gille |
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Institution: | 1. Institute of Microbiology, Academy of Sciences of the Czech Republic, 142 20, Prague 4, Czech Republic 2. Botanisches Institut, Universit?t Bonn, 53115, Bonn, Germany
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Abstract: | Effect of oxygen and metabolic substrates (glucose, ethanol) on the catalase activity of anaerobically grownSchizosaccharomyces pombe cells was assessed, and compared with that ofSaccharomyces cerevisiae in order to determine the catalase activity regulation inS. pombe. In contrast toS. cerevisiae, the total catalase activity of permeabilizedS. pombe anaerobically grown cells is higher than that found in aerobically grown cells, is stable and constant under all circumstances
(i.e. it is not induced by oxygen and/or substrates), and only a negligible part (3–5%) of it is contributed byde novo protein synthesis during aeration with or without substrates. The patent catalase activity of intact cells rises 2-fold during
6-h aeration without substrate and 7–8-fold in the presence of glucose or ethanol. The increase is not inhibited by cycloheximide
and is thus not due tode novo catalase synthesis, but may reflect enhanced transport of catalase to the cell surface or a permeabilization of the plasma
membrane during the aeration. |
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