title: Interaction of acrylodan with human serum albumin. A fluorescence spectroscopic study.
abstract: The binding of the fluorescent probe acrylodan (AC) to human serum albumin (HSA) was studied by fluorescence spectroscopy. The binding isotherms could be fitted to two types of sites. Competition experiments using iodoacetamide suggested that AC binds tightly on HSA by the cysteine-34. Attempts were made to find the location of the second site using high concentrations of warfarin, phenylbutazone, diazepam, indomethacin, palmitic acid or bilirubin in order to displace the bound AC to the HSA. Bilirubin was the only ligand able to displace the bound AC. This result suggests that AC, which is a very hydrophobic molecule also capable of labeling lysine residues, should also bind the human albumin in the primary site of bilirubin, but with less affinity than to the cysteine-34.
authors.affiliation: Departamento de Química-Física Farmacéutica, Facultad de Farmacia U.C.M., Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Moreno
authors.forename: M
authors.initials: M
authors.lastname: Cortijo
authors.forename: J
authors.initials: J
authors.lastname: González-Jiménez
mesh_terms: D015081:2-Naphthylamine / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D001665:Binding Sites; D001667:Binding, Competitive; D005454:Fluorescence Polarization; D005456:Fluorescent Dyes / Q000493:pharmacokinetics*; D006801:Humans; D066298:In Vitro Techniques; D007460:Iodoacetamide; D012709:Serum Albumin / Q000737:chemistry / Q000378:metabolism*; D013050:Spectrometry, Fluorescence
chemical_list: D005456:Fluorescent Dyes; D012709:Serum Albumin; C038518:acrylodan; D015081:2-Naphthylamine; D007460:Iodoacetamide