Terminal Oxidases of Chlorella pyrenoidosa |
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| Authors: | Sargent D F Taylor C P |
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| Affiliation: | Department of Biophysics, University of Western Ontario, London, Canada. |
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| Abstract: | In studies of the kinetics of oxygen uptake by glucose-stimulated Chlorella pyrenoidosa, two terminal oxidases could be distinguished. The cytochrome oxidase of Chlorella has a Km (O2) of 2.1 ± 0.3 μm, while the second oxidase has a Km (O2) of 6.7 ± 0.5 μm, and a maximum capacity about one-quarter of that of the cytochrome system. The identity of the second oxidase is unknown, but it is not inhibited by carbon monoxide, 1 mm cyanide, 0.1 mm thiocyanate, or 1 mm 8-hydroxyquinoline. In fresh cultures, the second oxidase accounts for at most 35% of the total oxygen uptake. |
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