Increased bisecting and core-fucosylated N-glycans on mutant human amyloid precursor proteins.
Alteration of glycoprotein glycans often changes various properties of the glycoprotein. To understand the significance of N-glycosylation in the pathogenesis of early-onset familial Alzheimer's disease (AD) and in beta-amyloid (Abeta) production, we examined whether the mutations in the amyloid precursor protein (APP) gene found in familial AD affect the N-glycans on APP. We purified the secreted forms of wild-type and mutant human APPs (both the Swedish type and the London type) produced by transfected C17 cells and determined the N-glycan structures of these three recombinant APPs. Although the major N-glycan species of the three APPs were similar, both mutant APPs contained higher contents of bisecting N-acetylglucosamine and core-fucose residues as compared to wild-type APP. These results demonstrate that familial AD mutations in the polypeptide backbone of APP can affect processing of the attached N-glycans; however, whether these changes in N-glycosylation affect Abeta production remains to be established.
Akasaka-Manya
Keiko
K
Glycobiology Research Group, Tokyo Metropolitan Institute of Gerontology, Foundation for Research on Aging and Promotion of Human Welfare, 35-2 Sakaecho, Itabashi-ku, Tokyo, 173-0015, Japan.
Manya
Hiroshi
H
Sakurai
Yoko
Y
Wojczyk
Boguslaw S
BS
Spitalnik
Steven L
SL
Endo
Tamao
T
D000544:Alzheimer Disease / Q000235:genetics / Q000378:metabolism; D016564:Amyloid beta-Protein Precursor / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002852:Chromatography, Ion Exchange; D006031:Glycosylation; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D011134:Polysaccharides / Q000737:chemistry*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
D016564:Amyloid beta-Protein Precursor; D011134:Polysaccharides; D011994:Recombinant Proteins