title: Identification of a novel bile acid in swans, tree ducks, and geese: 3alpha,7alpha,15alpha-trihydroxy-5beta-cholan-24-oic acid.
abstract: By HPLC, a taurine-conjugated bile acid with a retention time different from that of taurocholate was found to be present in the bile of the black-necked swan, Cygnus melanocoryphus. The bile acid was isolated and its structure, established by (1)H and (13)C NMR and mass spectrometry, was that of the taurine N-acyl amidate of 3alpha,7alpha,15alpha-trihydroxy-5beta-cholan-24-oic acid. The compound was shown to have chromatographic and spectroscopic properties that were identical to those of the taurine conjugate of authentic 3alpha,7alpha,15alpha-trihydroxy-5beta-cholan-24-oic acid, previously synthesized by us from ursodeoxycholic acid. By HPLC, the taurine conjugate of 3alpha,7alpha,15alpha-trihydroxy-5beta-cholan-24-oic acid was found to be present in 6 of 6 species in the subfamily Dendrocygninae (tree ducks) and in 10 of 13 species in the subfamily Anserinae (swans and geese) but not in other subfamilies in the Anatidae family. It was also not present in species from the other two families of the order Anseriformes. 3alpha,7alpha,15alpha-Trihydroxy-5beta-cholan-24-oic acid is a new primary bile acid that is present in the biliary bile acids of swans, tree ducks, and geese and may be termed 15alpha-hydroxy-chenodeoxycholic acid.
authors.affiliation: Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajousui, Setagaya, Tokyo 156-8550, Japan.
authors.forename: Genta
authors.initials: G
authors.lastname: Kakiyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Iida
authors.forename: Takaaki
authors.initials: T
authors.lastname: Goto
authors.forename: Nariyasu
authors.initials: N
authors.lastname: Mano
authors.forename: Junichi
authors.initials: J
authors.lastname: Goto
authors.forename: Toshio
authors.initials: T
authors.lastname: Nambara
authors.forename: Lee R
authors.initials: LR
authors.lastname: Hagey
authors.forename: Claudio D
authors.initials: CD
authors.lastname: Schteingart
authors.forename: Alan F
authors.initials: AF
authors.lastname: Hofmann
mesh_terms: D000818:Animals; D046090:Anseriformes / Q000145:classification / Q000378:metabolism*; D001647:Bile Acids and Salts / Q000737:chemistry* / Q000302:isolation & purification; D005075:Biological Evolution; D002635:Chenodeoxycholic Acid / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D002853:Chromatography, Liquid; D004372:Ducks / Q000378:metabolism*; D005777:Geese / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013045:Species Specificity; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D001647:Bile Acids and Salts; D002635:Chenodeoxycholic Acid