title: Oligosaccharides obtained from a blood-group-Sd(a+) Tamm-Horsfall glycoprotein. An n.m.r. study.
abstract: Treatment of Tamm-Horsfall urinary glycoprotein with Bacteroides fragilis endo-beta-galactosidase over a range of enzyme concentrations, pH and temperature resulted in the release of a small but constant proportion of the terminal sugars, which indicates the presence in the glycoprotein of relatively few enzyme-susceptible -GlcNAc beta 1-3Gal beta 1-4GlcNAc- units. Three oligosaccharides were isolated from the enzyme digest and characterized as Gal beta 1-4GlcNAc beta 1-3Gal, NeuAc alpha 2-3Gal beta 1-4 GlcNAc beta 1-3Gal and GalNAc beta 1-4(NeuAc alpha 2-3)Gal beta 1-4GlcNAc beta 1-3Gal by methylation analysis and exo-glycosidase digestion. The alditols of these oligosaccharides and related structures were examined by 500 MHz 1H-n.m.r. spectroscopy aided by spin-spin decoupling and two-dimensional correlated spectroscopy. An almost complete assignment of proton shifts was possible, and significant differences between the signals of some of the protons in the blood-group-Sda-active oligosaccharide III and literature values for the corresponding signals in the structurally related Cad-blood-group determinant are noted.
mesh_terms: D001789:Blood Group Antigens; D002854:Chromatography, Paper; D006026:Glycoside Hydrolases; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D009088:Mucoproteins; D009844:Oligosaccharides / Q000097:blood* / Q000302:isolation & purification; D058949:Uromodulin; D001616:beta-Galactosidase
chemical_list: D001789:Blood Group Antigens; D009088:Mucoproteins; D009844:Oligosaccharides; C548612:UMOD protein, human; D058949:Uromodulin; D006026:Glycoside Hydrolases; C026093:keratan-sulfate endo-1,4-beta-galactosidase; D001616:beta-Galactosidase