Abstract
The succinoxidase system, which is associated with mitochondria, is low in nonlactating mammary tissue throughout most of gestation but increases markedly near parturition. When only adenosine triphosphate (ATP) and Mg ++ are added to guinea pig mammary cyclophorase, succinate, oxalacetate, and α-ketoglutarate are rapidly oxidized, while fumarate is slowly oxidized. Malate and citrate are oxidized only when pyridine nucleotides are added. The fatty acid oxidase system is present in lactating guinea pig mammary cyclophorase. Evidence has been presented that some definite ratio exists among substrate, enzyme, and “sparking cooxidant” for optimum activity of this enzyme system.
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