title: 6-O-sulfo sialylparagloboside and sialyl Lewis X neo-glycolipids containing lactamized neuraminic acid: synthesis and antigenic reactivity against G159 monoclonal antibody.
abstract: Synthesis and antigenic reactivity of 6-O-sulfo sialylparagloboside (SPG) and sialyl Lewis X (sLeX) neo-glycolipids containing lactamized neuraminic acid are described. The suitably protected GlcNAc-beta (1-->3)-Gal-beta (1-->4)-GlcOSE derivative was glycosylated with NeuTFAc-alpha (2-->3)-Gal imidate to give NeuTFAc-alpha (2-->3)-Galbeta (1-->4)-GlcNAc-beta (1-->3)-Gal-beta (1-->4)-GlcOSE pentasaccharide. The partial N,O-deacylation in the NeuTFAc-alpha (2-->3)-Gal part afforded N-deacetylated SPG derivative which was converted to the desired oligosaccharide containing lactamized neuraminic acid. Similar treatment of the sLeX hexasaccharide derivative, NeuTFAc-alpha (2-->3)-Gal-beta (1-->4) [Fuc-alpha (1-->3)]-GlcNAc-beta (1-->3)-Gal-beta (1-->4)-GlcOSE, gave the key hexasaccharide intermediate containing lactamized neuraminic acid. These suitably protected SPG and sLex oligosaccharides were converted stepwise into the desired neo-glycolipids (GSC-551 and GSC-552) by the coupling with 2-(tetradecyl)hexadecanol, 6-O-sulfation at C-6 of the GlcNAc residure, and complete deprotection. Both lactamized-sialyl 6-O-sulfo SPG (GSC-551) and sLex (GSC-552) neo-glycolipids were clearly recognized with G159 monoclonal antibody showing that both the lactamized neuraminic acid and the 6-O-sulfate at C-6 of GlcNAc would be involved in the G159-defined determinant. However, the Fuc residue and the lipophilic (ceramide) part may not be critical for this recognition.
authors.affiliation: Department of Applied Bio-Organic Chemistry, Gifu University, Gifu, 501-1193, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: Hideharu
authors.initials: H
authors.lastname: Ishida
authors.forename: Akiko
authors.initials: A
authors.lastname: Kanamori
authors.forename: Reiji
authors.initials: R
authors.lastname: Kannagi
authors.forename: Makoto
authors.initials: M
authors.lastname: Kiso
mesh_terms: D000911:Antibodies, Monoclonal / Q000737:chemistry; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D005732:Gangliosides / Q000737:chemistry; D005915:Globosides / Q000138:chemical synthesis; D006017:Glycolipids / Q000138:chemical synthesis* / Q000737:chemistry / Q000276:immunology; D019041:L-Selectin / Q000737:chemistry*; D007769:Lactams / Q000138:chemical synthesis* / Q000276:immunology; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009438:Neuraminic Acids / Q000737:chemistry; D009844:Oligosaccharides / Q000737:chemistry* / Q000276:immunology; D025942:Oligosaccharides, Branched-Chain / Q000138:chemical synthesis; D000080506:Sialyl Lewis X Antigen
chemical_list: D000911:Antibodies, Monoclonal; D005732:Gangliosides; D005915:Globosides; D006017:Glycolipids; D007769:Lactams; D008024:Ligands; D009438:Neuraminic Acids; D009844:Oligosaccharides; D025942:Oligosaccharides, Branched-Chain; D000080506:Sialyl Lewis X Antigen; D019041:L-Selectin; C036363:paragloboside