title: Synthesis and applicability of photolabile 7,7-azo analogues of natural bile salt precursors.
abstract: In an approach to the identification of proteins involved in the side chain degradation of bile salt biosynthesis, the photolabile 7,7-azo derivatives of 5 beta-cholestane-3 alpha,7 alpha,12 alpha-triol, 5 beta-cholestane-3 alpha,7 alpha,12 alpha,26-tetrol and 3 alpha,7 alpha,12 alpha-trihydroxy-5 beta-cholestan-26-oate were synthesized. All 7,7-azo derivatives were metabolized by intact rat liver and freshly isolated rat hepatocytes in the same manner as the nonphotolabile physiological intermediates, resulting in the formation of the 7,7-azo analogues of cholyltaurine and cholylglycine. Photolysis of all three photolabile derivatives, using a light source with a maximum emission at 350 nm, occurred with a half-life of 2.1 min; their efficacy for photoaffinity labeling was demonstrated by incorporation into rat serum albumin.
authors.affiliation: Institut für Organische Chemie and Biochemie, Universität Freiburg, F.R.G.
authors.forename: T
authors.initials: T
authors.lastname: Gengenbacher
authors.forename: W
authors.initials: W
authors.lastname: Gerok
authors.forename: U
authors.initials: U
authors.lastname: Giese
authors.forename: G
authors.initials: G
authors.lastname: Kurz
mesh_terms: D000345:Affinity Labels; D000818:Animals; D001647:Bile Acids and Salts / Q000138:chemical synthesis* / Q000378:metabolism / Q000528:radiation effects; D001711:Biotransformation; D066298:In Vitro Techniques; D008099:Liver / Q000378:metabolism; D008297:Male; D015394:Molecular Structure; D010782:Photolysis; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000345:Affinity Labels; D001647:Bile Acids and Salts