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Journal of Experimental Biology 31,208-217 (1954)
Published by Company of Biologists 1954

The Respiratory and Glycolytic Enzymes of Sea-Urchin Eggs

MARTYNAS YAS ¹

¹ William G. Kerckhoff Laboratories of Biology, California Institute of Technology, Pasadena, California; Pioneering Research Laboratories, U.S. Army Quartermaster Corps, Philadelphia 45, Pennsylvania

1. Activity corresponding to phosphoglucomutase, phosphohexoisomerase, aldolase, triosephosphate dehydrogenase, enolase and lactic dehydrogenase has been demonstrated in homogenates prepared from unfertilized sea-urchin eggs (Strongylocentrotus purpuratus and Lytechinus pictus).

2. The presence of cytochromes a and b₁ has been confirmed. These cytochromes sediment in a relatively low centrifugal field.

3. No cytochrome c could be demonstrated, although cytochrome c is both reduced and oxidized by homogenates, and addition of cytochrome c increases the endogenous respiration and oxidation of succinate.

4. These results support the view that the usual glycolytic pathway operates in the sea-urchin egg and is the principal route of oxidation of carbohydrate.