The isolation and partial characterization of diphosphoglycerate mutase from human erythrocytes

W K Kappel, L F Hass


Diphosphoglycerate mutase has been purified to homogeneity from outdated human erythrocytes. The native enzyme has a molecular weight of 57 000 as determined by equilibrium centrifugation and exclusion chromatography. Disc gel electrophoresis in the presence of sodium dodecyl sulfate yields a single protein band with a molecular weight of about 26 500, indicating that diphosphoglycerate mutase is comprised of two subunits of similar mass. The enzyme exhibits the following intrinsic activities: diphosphoglyceratemutase, monophosphoglycerate mutase, and 2,3-diphosphoglycerate phosphatase. The latter activity is enhanced in the presence of either organic or inorganic anions. Glycolate-2-P, particularly, has a profound activating effect. Nonspecific phosphatase and enolase activities are absent. The enzyme has an extinction coefficient at 280 nm of 1.65 cm2/mg. The amino acid composition of the homogeneous protein has been determined.


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