title: Effects of 2,3-diphosphoglyceric acid on the human erythrocyte membrane phosphorylation system.
abstract: The effect of 2,3-diphosphoglycerate (2,3-P2-glycerate) on the phosphorylation of spectrin in solution by purified membrane cyclic AMP-independent protein kinase and in membrane preparations by the endogenous kinase was investigated. 2,3-P2-Glycerate inhibited spectrin phosphorylation both in solution and in the intact membrane. Kinetic analyses showed that 2,3-P2-glycerate had no effect on the Km for ATP but appeared to lower the Vmax of the reaction. When the effect of 2,3-P2-glycerate was examined in the presence of varying concentrations of spectrin, competitive inhibition kinetics were obtained. Interestingly, low concentrations of 2,3-P2-glycerate were found to effect the release of the membrane kinase from erythrocyte membranes. This release reaction may be related to the ability of 2,3-P2-glycerate to interfere with the interaction between the kinase and spectrin. The data suggest the possibility that the kinase may be bound to spectrin in the erythrocyte membrane. 2,3-P2-glycerate also caused the solubilization of 3-phosphoglyceraldehyde dehydrogenase, but not of cyclic AMP-dependent protein kinase. Taken together, our data indicate that 2,3-P2-glycerate may have a regulatory role in membrane protein phosphorylation and also may regulate the extent of association of the kinase with the membrane.
mesh_terms: D019794:2,3-Diphosphoglycerate; D000242:Cyclic AMP / Q000494:pharmacology; D004163:Diphosphoglyceric Acids / Q000494:pharmacology*; D004910:Erythrocyte Membrane / Q000187:drug effects / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D008565:Membrane Proteins / Q000378:metabolism*; D010766:Phosphorylation; D011494:Protein Kinases / Q000097:blood* / Q000302:isolation & purification; D012965:Sodium Chloride / Q000494:pharmacology; D013049:Spectrin / Q000378:metabolism*
chemical_list: D004163:Diphosphoglyceric Acids; D008565:Membrane Proteins; D013049:Spectrin; D019794:2,3-Diphosphoglycerate; D012965:Sodium Chloride; D000242:Cyclic AMP; D011494:Protein Kinases