Some enzymes of gluconeogenesis in various fractions of sarcocysts of Sarcocystis fusiformis of buffalo (Bubalus bubalis)

Sarcocystis fusiformis: some Krebs cycle enzymes in various fractions of sarcocysts of buffalo (Bubalus bubalis)

A biochemical investigation was carried out on the relative presence of some enzymes of the Krebs cycle and of the associated energy metabolism in various fractions (namely, cyst wall, cyst fluid and zoites) of sarcocysts of Sarcocystis fusiformis from the oesophageal muscles of naturally infected Indian water buffalo (Bubalus bubalis). Except for malate dehydrogenase, the activities of aconitase, isocitrate dehydrogenase, succinate dehydrogenase and fumarase were beyond detectable limits, pointing to a non-functional Krebs cycle in the cysts of this parasite. The activities of adenosine triphosphatase and cytochromes were lowest in cyst fluid and were maximally depicted by cyst wall and zoites.

Some enzymes of gluconeogenesis in various fractions of sarcocysts of Sarcocystis fusiformis of buffalo (Bubalus bubalis)

A biochemical study was conducted to assess the relative presence of some enzymes of gluconeogenesis in various fractions--the cyst wall, cyst fluid and zoites--of sarcocysts of Sarcocystis fusiformis obtained from the oesophageal muscles of naturally infected Indian water buffalo (Bubalus bubalis). The activities of fructose 1,6-diphosphatase and malic enzyme were beyond detectable limits. Phosphoenol pyruvate carboxykinase (PEPCK) activity was maximally present in the zoites, whereas glucose 6-phosphatase activity was highest in the cyst wall. PEPCK seemed to play a crucial role in carbon dioxide fixation metabolism.