obsolete pyruvate dehydrogenase (cytochrome) activity true pyruvate dehydrogenase (cytochrome) activity pyruvic (cytochrome b1) dehydrogenase activity molecular_function pyruvate:ferricytochrome-b1 oxidoreductase activity This term was made obsolete because the EC activity it represents, EC:1.2.2.2, has been deleted. pyruvate:ubiquinone-8-oxidoreductase activity GO:0008985 OBSOLETE. Catalysis of the reaction: pyruvate + ferricytochrome b1 + H2O = CO2 + acetate + ferrocytochrome b1. pyruvate dehydrogenase (quinone) activity