Molecular Pharmacology, Vol 1, 53-59, Copyright © 1965 by the American Society for Pharmacology and Experimental Therapeutics

Factors Influencing the Stability of Heart Phosphofructokinase

¹ Department of Pharmacology, Stanford University School of Medicine, Palo Alto, California

Phosphofructokinase from the guinea pig heart is an extremely labile enzynme. It becomes more stable in the presence of perchloric acid extracts from the liver. Fructose-1,6-P₂ has been identified in these extracts as a potent stabilizer for the enzyme. The stabilizing effects for enzyme activity of the following four groups of compounds were tested: thiol derivatives, hexose phosphate, adenylic nucleotides, and polyvalent inorganic anions. The most potent representatives of these groups are: glutathione or mercaptoethanol, fructose-1,6-P₂, ADP or ATP, and phosphate or sulfate anion. A combination of these agents, besides providing complete protection for the enzyme, causes a slight activation during incubation.

Note:
ACKNOWLEDGMENT Supported by Research Grant AI04214 from the National Institute of Allergy and Infectious Diseases, U.S. Public Health Service; Research Career Development Award GM-K3-3848 from the Division of General Medical Sciences, U.S. Public Health Service: and a grant from the Santa Clara County Heart Association.

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