title: Carbohydrate structure of a thrombin-like serine protease from Agkistrodon rhodostoma. Structure elucidation of oligosaccharides by methylation analysis, liquid secondary-ion mass spectrometry and proton magnetic resonance.
abstract: The carbohydrate side chains of the thrombin-like serine protease ancrod from the venom of the Malayan pit viper Agkistrodon rhodostoma were liberated from tryptic glycopeptides by treatment with peptide-N4-(N-acetyl-beta-glucosaminyl)asparagine amidase F and fractionated by high-performance liquid chromatography. Glycans obtained were characterized by digestion with exoglycosidases, methylation analysis and, in part, by liquid secondary-ion mass spectrometry and 1H-NMR spectroscopy. The results reveal that this snake venom glycoprotein contains partially truncated di-, tri- and tetraantennary complex type N-glycans carrying Fuc(alpha 1-6) residues at the innermost N-acetylglucosamine and solely (alpha 2-3)-linked sialic acid substituents. As a characteristic feature, ancrod oligosaccharides comprise mainly sialylated Gal beta 3GlcNAc beta lactosamine antennae. Furthermore, a small proportion of the sugar chains were found to carry a NeuAc alpha 3GalNAc beta 4GlcNAc beta antenna exclusively linked to C-2 of Man(alpha 1-3) residues of the pentasaccharide core. Thus, many of the glycans found represent novel glycoprotein-N-glycan structures.
authors.affiliation: Biochemisches Institut am Klinikum der Universität, Giessen, Federal Republic of Germany.
authors.forename: G
authors.initials: G
authors.lastname: Pfeiffer
authors.forename: U
authors.initials: U
authors.lastname: Dabrowski
authors.forename: J
authors.initials: J
authors.lastname: Dabrowski
authors.forename: S
authors.initials: S
authors.lastname: Stirm
authors.forename: K H
authors.initials: KH
authors.lastname: Strube
authors.forename: R
authors.initials: R
authors.lastname: Geyer
mesh_terms: D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry / Q000379:methods; D008745:Methylation; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000378:metabolism*; D011522:Protons; D012697:Serine Endopeptidases / Q000378:metabolism*; D013917:Thrombin / Q000378:metabolism*; D014757:Viper Venoms / Q000201:enzymology*
chemical_list: D009844:Oligosaccharides; D011522:Protons; D014757:Viper Venoms; D012697:Serine Endopeptidases; D013917:Thrombin