title: Structural study of the N-glycans of intercellular adhesion molecule-5 (telencephalin).
abstract: Intercellular adhesion molecule-5 (ICAM-5, telencephalin) is a dendritically polarized membrane glycoprotein expressed in tissues distinct from those expressing other ICAMs. Here, we determined the N-glycan structure of ICAM-5 purified from adult rat brain and compared it with that of other ICAMs. N-glycans were released by N-glycosidase F digestion and labeled with p-amino benzoic octylester (ABOE). ABOE-labeled glycans were analyzed by high performance liquid chromatography (HPLC) and mass spectrometry. The N-glycans obtained from rat brain ICAM-5 consisted of approximately 85% neutral, 10.2% sialylated-only, 2.8% sulfated-only, and 1.2% sialylated and sulfated glycans. Compared with the N-glycan structures of human ICAM-1 expressed in CHO cells, HEK cells, or mouse myeloma cells and ICAM-3 isolated from human T-cells, rat brain ICAM-5 had less highly branched glycans, sialylated glycans, and N-acetyllactosamine structures. In contrast, high-mannose-type N-glycans and Lewis X were more commonly found in rat brain ICAM-5 than in human ICAM-1 expressed in CHO cells, HEK cells, or mouse myeloma cells and ICAM-3 isolated from human T-cells. In addition, sulfated glycans contained GlcNAc 6-O-sulfate on the non-reducing terminal side. Our data will be important for the elucidation of the roles of the N-glycans expressed in neural cells, including those present on ICAM-5.
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. j6407702@ed.noda.tus.ac.jp
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Ohgomori
authors.forename: Osamu
authors.initials: O
authors.lastname: Funatsu
authors.forename: Syu-ichi
authors.initials: S
authors.lastname: Nakaya
authors.forename: Akinori
authors.initials: A
authors.lastname: Morita
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ikekita
mesh_terms: D010129:4-Aminobenzoic Acid / Q000737:chemistry; D000818:Animals; D016466:CHO Cells; D002240:Carbohydrate Sequence; D015815:Cell Adhesion Molecules / Q000737:chemistry / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006224:Cricetinae; D003412:Cricetulus; D006801:Humans; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000378:metabolism*; D019006:Neural Cell Adhesion Molecules / Q000737:chemistry / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism; D011134:Polysaccharides / Q000737:chemistry* / Q000378:metabolism; D011817:Rabbits; D051381:Rats; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000379:methods; D062366:para-Aminobenzoates
chemical_list: D015815:Cell Adhesion Molecules; C547413:ICAM5 protein, rat; D009419:Nerve Tissue Proteins; D019006:Neural Cell Adhesion Molecules; D011134:Polysaccharides; D062366:para-Aminobenzoates; D010129:4-Aminobenzoic Acid