Abstract
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 β-amyloid (Aβ) 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 Aβ production remains to be established.
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Abbreviations
- AB:
-
aminobezamide
- Aβ:
-
β-amyloid
- AD:
-
Alzheimer’s disease
- APP:
-
amyloid precursor protein
- FUT8:
-
α1–6 fucosyltransferase
- GnT-III:
-
N-acetylglucosaminyltransferase III
- HPLC:
-
high-performance liquid chromatography
- GU:
-
glucose unit
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Acknowledgement
We would like to thank Dr. Takashi Muramatsu for providing an endo-β-galactosidase C. This study was supported by a Grant-in-Aid for Scientific Research (20390031) from the Japan Society for the Promotion of Science.
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Keiko Akasaka-Manya and Hiroshi Manya contributed equally to this work.
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Akasaka-Manya, K., Manya, H., Sakurai, Y. et al. Increased bisecting and core-fucosylated N-glycans on mutant human amyloid precursor proteins. Glycoconj J 25, 775–786 (2008). https://doi.org/10.1007/s10719-008-9140-x
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DOI: https://doi.org/10.1007/s10719-008-9140-x