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Journal of Experimental Biology, Vol 182, Issue 1 271-273, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

COMPARTMENTATION OF LIVER PHOSPHOENOLPYRUVATE CARBOXYKINASE IN THE AQUATIC TURTLE PSEUDEMYS SCRIPTA ELEGANS: A REASSESSMENT

C. S. Land and P. W. Hochachka

Phosphoenolpyruvate carboxykinase (PEPCK) catalyses the conversion of oxaloacetate to pyruvate in the first step of gluconeogenesis. Since oxaloacetate is impermeable to the inner mitochondrial membrane, the localisation of PEPCK within the cell plays a major role in defining substrate preferences for gluconeogenesis. As a result, the immunochemically distinct isoenzymes of PEPCK found within the mitochondrial and the cytosolic cell fractions vary in their proportion to one another between organs and species and with prandial state.




© The Company of Biologists Ltd 1993