title: Solubility behavior of enzymes after addition of polyethylene glycol to erythrocyte hemolysates.
abstract: The addition of polyethylene glycol to a hemolysate of rat erythrocytes reduces the solubility of phosphofructokinase and glucose-6-phosphate and 6-phosphogluconate dehydrogenases in an exponential manner with respect to polymer concentration. Analyses of the solubility curves (log solubility versus polymer concentration) obtained at different pH values suggest that the solubility can be related to both the aggregation state and the intrinsic solubility of the proteins promoted by solution conditions. These findings suggest the possibility of using polyethylene glycol in a rational way for the fractional precipitation of a mixture.
authors.affiliation: Departamento de Bioquimica y Biologia Molecular, Universidad de Alcala de Henares, Madrid, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Delgado
authors.forename: A
authors.initials: A
authors.lastname: Rubio
authors.forename: J
authors.initials: J
authors.lastname: Luque
authors.forename: M C
authors.initials: MC
authors.lastname: Tejedor
mesh_terms: D000818:Animals; D004912:Erythrocytes / Q000201:enzymology*; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D006461:Hemolysis; D066298:In Vitro Techniques; D010732:Phosphofructokinase-1 / Q000378:metabolism; D010734:Phosphogluconate Dehydrogenase / Q000378:metabolism; D011092:Polyethylene Glycols / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D012995:Solubility
chemical_list: D011092:Polyethylene Glycols; D010734:Phosphogluconate Dehydrogenase; D005954:Glucosephosphate Dehydrogenase; D010732:Phosphofructokinase-1