PMID- 10211705 OWN - NLM STAT- MEDLINE DCOM- 19990607 LR - 20191024 IS - 0282-0080 (Print) IS - 0282-0080 (Linking) VI - 15 IP - 10 DP - 1998 Oct TI - Evidence for a site-specific fucosylation of N-linked oligosaccharide of immunoglobulin A1 from normal human serum. PG - 995-1000 AB - Glycopeptides containing the N-linked oligosaccharide from human serum IgA1 were analyzed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOFMS). Two glycopeptides, GP1 and GP2, prepared from the endoproteinase Asp-N digest of the IgA1 heavy chain, were derived from the CH2 domain (N-glycan site at Asn263) and the tailpiece portion (N-glycan site at Asn459), respectively. The structure of the attached sugar chain was deduced from the mass number of the glycopeptide and confirmed by a two-dimensional mapping technique for a pyridylaminated oligosaccharide. GP1 was composed of two major components having a fully galactosylated bianntena sugar chain with or without a bisecting N-acetylglucosamine (GlcNAc) residue. On the other hand, the GP2 fraction corresponded to the glycopeptides having a fully galactosylated and fucosylated bianntena sugar chain partly bearing a bisecting GlcNAc residue. Thus, the site-specific fucosylation of the N-linked oligosaccharide on the tailpiece of the alpha1 chain became evident for normal human serum IgA1. FAU - Tanaka, A AU - Tanaka A AD - Analytical Research Laboratory, Asahi Chemical Industry Co., Ltd., Fuji, Shizuoka, Japan. FAU - Iwase, H AU - Iwase H FAU - Hiki, Y AU - Hiki Y FAU - Kokubo, T AU - Kokubo T FAU - Ishii-Karakasa, I AU - Ishii-Karakasa I FAU - Toma, K AU - Toma K FAU - Kobayashi, Y AU - Kobayashi Y FAU - Hotta, K AU - Hotta K LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Glycoconj J JT - Glycoconjugate journal JID - 8603310 RN - 0 (Immunoglobulin A) RN - 0 (Oligosaccharides) RN - 28RYY2IV3F (Fucose) SB - IM MH - Amino Acid Sequence MH - Carbohydrate Sequence MH - Fucose/*metabolism MH - Humans MH - Immunoglobulin A/*blood/chemistry MH - Molecular Sequence Data MH - Oligosaccharides/chemistry/*metabolism MH - Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization EDAT- 1999/04/22 00:00 MHDA- 1999/04/22 00:01 CRDT- 1999/04/22 00:00 PHST- 1999/04/22 00:00 [pubmed] PHST- 1999/04/22 00:01 [medline] PHST- 1999/04/22 00:00 [entrez] AID - 10.1023/a:1006989910120 [doi] PST - ppublish SO - Glycoconj J. 1998 Oct;15(10):995-1000. doi: 10.1023/a:1006989910120.