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• W2043121489 abstract "The effects of various ligands on bilirubin-serum albumin complexes in aqueous solution were investigated at pH 7.4 and 27 °C by circular dichroism (CD) measurements. The ligands included various penicillins, benzoic acid derivatives, and various lower aliphatic alcohols, using a molar excess of charcoal-treated human or bovine serum albumin with respect to bilirubin. In all cases investigated, significant changes in the visible-range CD spectra of the bilirubin-serum albumin complexes occurred within a certain range of added ligand concentrations. For several such ligand systems, analogous CD effects could be measured on both diluted and undiluted human blood serum or plasma. For part of the isolated albumin-ligand systems, significant dissociation of the bilirubin from the albumin was demonstrated by electrophoretic and analytical ultracentrifugation measurements, while other systems did not reveal measurable dissociation under the conditions used, indicating the formation of a ternary complex. A scheme of equilibria among all complex components is proposed, which includes both dissociation of the bilirubin and ternary complex formation in which the bilirubin conformation appears to be modified. At least two different sets of binding sites (competitive and noncompetitive) for added ligands are assumed. Values of apparent parameters describing the formation of ternary complexes from the bilirubin-albumin complex are estimated for a number of systems. Some relationships between the chemical structure of a ligand and its effect on the bilirubin-serum albumin complex are deduced. The relevance of the results obtained for the isolated protein-ligand complexes with respect to in vivo conditions is evaluated." @default.
• W2043121489 created "2016-06-24" @default.
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• W2043121489 date "1979-03-01" @default.
• W2043121489 modified "2023-09-25" @default.
• W2043121489 title "Circular dichroism and hydrodynamic measurements of ternary protein—Two ligand systems: Serum albumin-bilirubin-drug or alcohol" @default.
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• W2043121489 doi "https://doi.org/10.1016/0003-9861(79)90023-7" @default.
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