Abstract
Growth of copper deficient yeast cells in copper supplemented medium led to an increase in the amount of cytochrome c oxidase and cytochromes b and c . Potentiometric titration of cytochrome c oxidase showed that the oxidation-reduction midpoint potentials of cytochromes a and a 3 were, respectively, for cells grown at 56μg copper/liter: 205 ± 10, 325 ± 10; for cells grown at 140μg copper/liter, 215 ± 10, 360 ± 10; and for cells grown at 330μg copper/liter, 215 ± 10, and 345 ± 10. Data showed that the midpoint potential of cytochromes a and a 3 in yeast mitochondria was close to the value reported for rat liver and beef heart mitochondria. In addition the stimulation of cytochrome c oxidase biosynthesis in yeast by copper does not alter significantly the redox properties of the enzyme.
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