Accession Number : AD0618513

Title :   STEROID-PROTEIN INTERACTIONS.

Descriptive Note : Progress rept. for 16 Nov 63-31 May 65,

Corporate Author : LOUISVILLE UNIV KY SCHOOL OF MEDICINE

Personal Author(s) : Westphal,Ulrich F.

Report Date : 31 MAY 1965

Pagination or Media Count : 17

Abstract : Studies on the binding of progesterone to alpha-1-acid glycoprotein were continued. A decreasing effect of traces of heavy metals, especially Fe(++), on the binding affinity was observed. Complete deionization of the test system is necessary. Purification of human corticosteroid-binding blobulin (CBG) by DEAE cellulose chromatography and hydroxylapatite adsorption procedures resulted in an overall concentration of about 700-fold. Application of similar chromatographic techniques, including sephadex G-200 fractionation, to rabbit serum yielded preparations that were purified approximately 2000-fold. Sera of man, monkey, rat, rabbit and guinea pig were freed of endogenous corticosteroids by sephadex filtration at 45C. The binding affinities of these sera were then determined by multiple equilibrium dialysis at five concentrations each of cortisol, corticosterone and progesterone, at 4C and 37C. Concentrations of corticosteroid-binding sites and their association constants were determined. (Author)

Descriptors :   (*STEROIDS, PROTEINS), (*PROTEINS, STEROIDS), (*PROGESTERONE, MOLECULAR ASSOCIATION), (*GLYCOPROTEINS, MOLECULAR ASSOCIATION), IMPURITIES, IRON, GLOBULINS, PURIFICATION, CHROMATOGRAPHIC ANALYSIS, ADSORPTION, BLOOD SERUM, SEPARATION, CORTICOSTEROID AGENTS, OSMOSIS, ALBUMINS, ALCOHOLS

Distribution Statement : APPROVED FOR PUBLIC RELEASE