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Biol Bull 117: 454-457. (December 1959)
© 1959 Marine Biological Laboratory
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CYTOCHROME OXIDASE AND OXIDATION OF CO IN EGGS OF THE SEA URCHIN STRONGYLOCENTROTUS PURPURATUS

ROBERT E. BLACK 1 and ALBERT TYLER 1

1 Division of Biology, California Institute of Technology, Pasadena, California

1. The cytochrome oxidase activity and ability to oxidize CO (labelled with C18) have been determined for sedimented, washed particles obtained from unfertilized eggs of the sea urchin, Strongylocentrotus purpuratus. Both added cytochrome c and ascorbate were required for the rapid oxidation of CO by the particles, and it is concluded that cytochrome oxidase is in the pathway of oxidation.

2. In the light, the rate of CO-oxidation was found to be greatest at the concentration of cytochrome c which gave about frac12 the maximum O2-uptake. When the uptake of oxygen was maximal, the CO inhibited both the O2-uptake and the CO-oxidation in the light. In the dark the rates of CO-oxidation by the particles were not greatly affected by changes in the level of cytochrome c. The results are used as a basis for the interpretation of developmental changes in CO-oxidation in embryos.






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Copyright © 1959 by the Marine Biological Laboratory.