Determination of the glucurono-conjugated position in bile alcohol glucuronides excreted in urine of a patient with cerebrotendinous xanthomatosis by a nuclear magnetic resonance study.

Abstract

This paper describes the determination of the glucurono-conjugated position in two bile alcohol glucuronides excreted in urine of a patient with cerebrotendinous xanthomatosis by a nuclear magnetic resonance study. The urine sample was extracted with reversed-phase resin, and chromatographed on a reversed-phase partition column and a silica gel column to isolate glucurono-conjugates of 5 beta-cholestane-3 alpha, 7 alpha, 12 alpha, 25-tetrol and 5 beta-cholestane-3 alpha, 7 alpha, 12 alpha, 23,25- pentol. Proton and carbon-13 nuclear magnetic resonance spectra of the natural tetrol glucuronide were identical with those of the chemically synthesized tetrol glucuronide, 7 alpha, 12 alpha, 25-trihydroxy-5 beta-cholestane-3 alpha-O-beta-D- glucopyranosyluronic acid. Hence, the glucurono-conjugated position of the natural tetrol glucuronide was determined to be the C-3 position. By comparison of the 13C chemical shift data with that of the unconjugated pentol, 5 beta-cholestane-3 alpha, 7 alpha, 23,25-pentol, the glucurono-conjugated position of the natural pentol glucuronide was determined to be C-23. Thus the natural pentol glucuronide can be formulated as 3 alpha, 7 alpha, 12 alpha, 25- tetrahydroxy-5 beta-cholestane-23-O-beta-D-glucopyranosyluronic acid. The difference in the glucurono-conjugated position between the 25-tetrol glucuronide and the 23,25-pentol glucuronide indicates that the former is not the biosynthetic precursor of the latter.

• Authors: T Kuramoto, K Fukuda, A Ohshima, K Kihira, T Hoshita
• Journal: Journal of biochemistry (J Biochem) Vol. 115 Issue 4 Pg. 655-8 (Apr 1994) ISSN: 0021-924X [Print] England
• PMID: 8089079 (Publication Type: Journal Article)

Chemical References

• Cholestanols
• Glucuronates

Topics

• Cholestanols (chemistry)
• Glucuronates (chemistry, urine)
• Humans
• Magnetic Resonance Spectroscopy
• Xanthomatosis (urine)