Isolation and partial characterization of monophosphoglycerate mutase from human erythrocytes.

Monophosphoglycerate mutase has been purified to homogeneity from outdated human erythrocytes as indicated by exclusion chromatography, polyacrylamide gel electrophoresis, and equilibrium centrifugation. Occasionally, the recommended purification procedure yields a small amount (3% or less) of a single extraneous protein which can be deleted from the enzyme preparation by employing an additional purification step. The native enzyme has a molecular weight of 54,000 to 56,000 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 28,600, indicating that the native macromolecule is a dimer composed of subunits of similar mass. Homogeneous monophosphoglycerate mutase is free of diphosphoglycerate mutase, enolase, and nonspecific phosphatase activities; however, the enzyme manifests intrinsic 2,3-diphospho-D-glycerate phosphatase activity as shown by thermal denaturation studies. The diphosphatase activity is stimulated by PPi and glycolate-2-P, but is inhibited by Cl-, HSO3-, and Pi. The pH optimum for both the diphosphatase and the mutase is 6.8. The Km for 2,3-diphospho-D-glycerate in the phosphatase reaction is 82 muM at 37 degrees and pH 7.2. The amino acid composition of homogeneous monophosphoglycerate mutase is given.

• Publication year

  1976

• Venue

  Journal of Biological Chemistry

• Publication date

  1976-11-10

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(17)33001-6PMID 10303
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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