title: Glycan side chains on naturally presented MHC class II ligands.
abstract: The molecular characterization of unknown naturally presented major histocompatibility complex (MHC) class II glycopeptides carrying complex glycans has so far not been achieved, reflecting the different fragmentation characteristics of sugars and peptides in mass spectrometric analysis. Human leukocyte antigen (HLA)-DR-bound peptides were isolated by affinity purification, separated via high performance liquid chromatography and analyzed by matrix-assisted laser desorption/ionization and electrospray ionization mass spectrometry. We were able to identify two naturally processed MHC class II ligands, CD53(122-136) and CD53(121-136), carrying complex N-linked glycan side chains by a combination of in-source and collision-induced fragmentation on a quadrupole time-of-flight tandem mass spectrometer.
authors.affiliation: Department of Immunology, Institute for Cell Biology, University of Tübingen, 72076 Tübingen, Germany.
authors.forename: Jörn
authors.initials: J
authors.lastname: Dengjel
authors.forename: Hans-Georg
authors.initials: HG
authors.lastname: Rammensee
authors.forename: Stefan
authors.initials: S
authors.lastname: Stevanovic
mesh_terms: D006031:Glycosylation; D006680:HLA Antigens / Q000032:analysis*; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D008024:Ligands; D011134:Polysaccharides / Q000032:analysis*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D006680:HLA Antigens; D000949:Histocompatibility Antigens Class II; D008024:Ligands; D011134:Polysaccharides