Biomaterial Database

Octanoate binding to the indole- and benzodiazepine-binding region of human serum albumin. 1991

U Kragh-Hansen

Institute of Medical Biochemistry, University of Aarhus, Denmark.

Binding of L-tryptophan, diazepam and octanoate to defatted human serum albumin was studied at pH 7.0 by equilibrium dialysis at low ligand/protein molar ratios. L-Tryptophan binding takes place at only one site of the protein with an association constant of 4.4 x 10(4) M-1. Under the present experimental conditions, binding of diazepam and octanoate could be accounted for by high-affinity binding alone with primary association constants of 3.8 x 10(5) M-1 and 1.6 x 10(6) M-1 respectively. During the simultaneous presence of L-tryptophan plus octanoate or diazepam plus octanoate, pronounced mutual reductions in binding were observed. Analysis of the data suggests that the reductions in binding represent competition for a common high-affinity binding site. Thus a region seems to exist that is capable of binding one molecule of these diverse ligands with a high affinity. The location of this region within the albumin molecule is discussed.

UI	MeSH Term	Description	Entries
D007211	Indoles	Benzopyrroles with the nitrogen at the number one carbon adjacent to the benzyl portion, in contrast to ISOINDOLES which have the nitrogen away from the six-membered ring.
D007700	Kinetics	The rate dynamics in chemical or physical systems.
D002210	Caprylates	Derivatives of caprylic acid. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain a carboxy terminated eight carbon aliphatic structure.	Caprylate,Octanoates,Caprylic Acids,Octanoic Acids,Acids, Caprylic,Acids, Octanoic
D003956	Dialysis	A process of selective diffusion through a membrane. It is usually used to separate low-molecular-weight solutes which diffuse through the membrane from the colloidal and high-molecular-weight solutes which do not. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Dialyses
D003975	Diazepam	A benzodiazepine with anticonvulsant, anxiolytic, sedative, muscle relaxant, and amnesic properties and a long duration of action. Its actions are mediated by enhancement of GAMMA-AMINOBUTYRIC ACID activity.	7-Chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one,Apaurin,Diazemuls,Faustan,Relanium,Seduxen,Sibazon,Stesolid,Valium
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001665	Binding Sites	The parts of a macromolecule that directly participate in its specific combination with another molecule.	Combining Site,Binding Site,Combining Sites,Site, Binding,Site, Combining,Sites, Binding,Sites, Combining
D012709	Serum Albumin	A major protein in the BLOOD. It is important in maintaining the colloidal osmotic pressure and transporting large organic molecules.	Plasma Albumin,Albumin, Serum