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Biliary bile acids in birds of the Cotingidae family: taurine-conjugated (24R,25R)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid and two epimers (25R and 25S) of 3α,7α-dihydroxy-5β-cholestan-27-oic acid. 2011

Lee R Hagey, and Takashi Iida, and Shoujiro Ogawa, and Yuuki Adachi, and Mizuho Une, and Kumiko Mushiake, and Masamitsu Maekawa, and Miki Shimada, and Nariyasu Mano, and Alan F Hofmann
Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0063, USA.

Three C(27) bile acids were found to be major biliary bile acids in the capuchinbird (Perissocephalus tricolor) and bare-throated bellbird (Procnias nudicollis), both members of the Cotingidae family of the order Passeriformes. The individual bile acids were isolated by preparative RP-HPLC, and their structures were established by RP-HPLC, LC/ESI-MS/MS and NMR as well as by a comparison of their chromatographic properties with those of authentic reference standards of their 12α-hydroxy derivatives. The most abundant bile acid present in the capuchinbird bile was the taurine conjugate of C(27) (24R,25R)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid, a diastereomer not previously identified as a natural bile acid. The four diastereomers of taurine-conjugated (24ξ,25ξ)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid could be distinguished by NMR and were resolved by RP-HPLC. The RRT of the diastereomers (with taurocholic acid as 1.0) were found to be increased in the following order: (24R,25R)<(24S,25R)<(24S,25S)<(24R,25S). Two epimers (25R and 25S) of C(27) 3α,7α-dihydroxy-5β-cholestan-27-oic acid were also present (as the taurine conjugates) in both bird species. Epimers of the two compounds could be distinguished by their NMR spectra and resolved by RP-HPLC with the (25S)-epimer eluting before the (25R)-epimer. Characterization of the taurine-conjugated (24R,25R)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid and two epimers (25R and 25S) of 3α,7α-dihydroxy-5β-cholestan-27-oic acid should facilitate their detection in peroxisomal disease and inborn errors of bile acid biosynthesis.

UI MeSH Term Description Entries
D009682 Magnetic Resonance Spectroscopy Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING). In Vivo NMR Spectroscopy,MR Spectroscopy,Magnetic Resonance,NMR Spectroscopy,NMR Spectroscopy, In Vivo,Nuclear Magnetic Resonance,Spectroscopy, Magnetic Resonance,Spectroscopy, NMR,Spectroscopy, Nuclear Magnetic Resonance,Magnetic Resonance Spectroscopies,Magnetic Resonance, Nuclear,NMR Spectroscopies,Resonance Spectroscopy, Magnetic,Resonance, Magnetic,Resonance, Nuclear Magnetic,Spectroscopies, NMR,Spectroscopy, MR
D002853 Chromatography, Liquid Chromatographic techniques in which the mobile phase is a liquid. Liquid Chromatography
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001647 Bile Acids and Salts Steroid acids and salts. The primary bile acids are derived from cholesterol in the liver and usually conjugated with glycine or taurine. The secondary bile acids are further modified by bacteria in the intestine. They play an important role in the digestion and absorption of fat. They have also been used pharmacologically, especially in the treatment of gallstones. Bile Acid,Bile Salt,Bile Salts,Bile Acids,Acid, Bile,Acids, Bile,Salt, Bile,Salts, Bile
D001717 Birds Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves. Aves,Bird
D013654 Taurine A conditionally essential nutrient, important during mammalian development. It is present in milk but is isolated mostly from ox bile and strongly conjugates bile acids. Taufon,Tauphon,Taurine Hydrochloride,Taurine Zinc Salt (2:1),Taurine, Monopotassium Salt
D015394 Molecular Structure The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds. Structure, Molecular,Molecular Structures,Structures, Molecular
D053719 Tandem Mass Spectrometry A mass spectrometry technique using two (MS/MS) or more mass analyzers. With two in tandem, the precursor ions are mass-selected by a first mass analyzer, and focused into a collision region where they are then fragmented into product ions which are then characterized by a second mass analyzer. A variety of techniques are used to separate the compounds, ionize them, and introduce them to the first mass analyzer. For example, for in GC-MS/MS, GAS CHROMATOGRAPHY-MASS SPECTROMETRY is involved in separating relatively small compounds by GAS CHROMATOGRAPHY prior to injecting them into an ionization chamber for the mass selection. Mass Spectrometry-Mass Spectrometry,Mass Spectrometry Mass Spectrometry,Mass Spectrometry, Tandem

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