Kinetic properties and essential amino acids of the 2,3-bisphosphoglycerate synthase-phosphatase from pig skeletal muscle

Histidine, arginine and lysine residues are essential for the multifunctional 2,3-bisphosphoglycerate synthase-phosphatase purified from pig skeletal muscle. The synthase, phosphatase and phosphoglycerate mutase activities of the enzyme are concurrently lost upon treatment with diethylpyrocarbonate, phenylglyoxal and trinitrobenzenesulfonate. The phosphatase activity shows hyperbolic kinetics. In contrast, the synthase activity shows a nonhyperbolic pattern which fits to a second-degree polynomial. The Km values for glycerate 1,3-P2, glycerate 3-P and glycerate 2,3-P2 are similar to those of the enzyme from mammalian erythrocytes.