title: [Estradiol-binding properties of a sheep haptoglobin complex with hemoglobin. II. Preliminary data on quantitative characteristics of interaction].
abstract: The estradiol-binding properties of the sheep haptoglobin-hemoglobin complex (Hp-Hb) have been studied. The time and temperature dependencies of the steroid binding have been established the tightly bound 17 beta-estradiol, which is not detached from the complex during precipitation or extraction, has been shown to form a part of the total amount of the steroid capable of bending to Hp-Hb. Disturbances in the protein-protein interactions between Hp and Hb lead to the dissociation of estradiol as well as to the loss by the protein of its estradiol-binding activity. The values of relative competitive activity for several steroids suggest that some structural elements of the 17 beta-estradiol molecule play a role in estradiol-protein interactions. It is assumed that the Hp-Hb complex has two or more 17 beta-estradiol binding sites.
authors.forename: G M
authors.initials: GM
authors.lastname: Isaeva
authors.forename: R U
authors.initials: RU
authors.lastname: Beĭsembaeva
mesh_terms: D000818:Animals; D001665:Binding Sites; D002846:Chromatography, Affinity; D004958:Estradiol / Q000378:metabolism*; D006242:Haptoglobins / Q000302:isolation & purification / Q000378:metabolism*; D006454:Hemoglobins / Q000378:metabolism*; D007700:Kinetics; D012756:Sheep; D013696:Temperature
chemical_list: D006242:Haptoglobins; D006454:Hemoglobins; D004958:Estradiol
vernacular_title: Estradiolsviazyvaiushchie svoĭstva kompleksa gaptoglobina ovtsy s gemoglobinom. II. Predvaritel'nye dannye po kolichestvennoĭ kharakteristike vzaimodeĭstviia.