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Identification of the glycosylated sequons of human myelin-associated glycoprotein
D Burger1, L Pidoux, A J Steck
1Department of Neurology, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
Abstract:
Myelin-associated glycoprotein (MAG) is a neural cell adhesion molecule expressing the L2/HNK-1 carbohydrate epitope. MAG is heavily glycosylated containing 30% carbohydrate by weight. In this study, human MAG glycopeptides were isolated and sequenced. Of the 9 MAG sequons 7 were glycosylated and 1 was partially glycosylated at Asn106. Asn332 which was not recovered in the glycopeptide fractions was probably not glycosylated. Furthermore, preliminary data indicate that all MAG glycosylated sequons might bear the L2/HNK-1 epitope.
Insights
Myelin-associated glycoprotein (MAG) is a key neural adhesion molecule. This study identified glycosylation sites on human MAG, revealing that most sequons are glycosylated and may carry the L2/HNK-1 epitope.
Area of Science:
- Neuroscience
- Glycobiology
- Molecular Biology
Background:
- Myelin-associated glycoprotein (MAG) is a crucial neural cell adhesion molecule.
- MAG plays a role in neural development and function.
- It expresses the L2/HNK-1 carbohydrate epitope and is heavily glycosylated.
Purpose of the Study:
- To identify and characterize the glycosylation sites on human MAG.
- To determine which sequons (N-glycosylation sites) are glycosylated.
- To investigate the potential link between glycosylation and the L2/HNK-1 epitope on MAG.
Main Methods:
- Isolation and sequencing of human MAG glycopeptides.
- Analysis of N-glycosylation sequons within the MAG sequence.
- Preliminary analysis of the L2/HNK-1 epitope on glycosylated MAG sequons.
Main Results:
- Seven out of nine identified MAG sequons were found to be glycosylated.
- One sequon at Asn106 was partially glycosylated.
- The sequon at Asn332 was likely not glycosylated.
- Preliminary data suggest all glycosylated MAG sequons may bear the L2/HNK-1 epitope.
Conclusions:
- The study provides a detailed map of glycosylation sites on human MAG.
- These findings contribute to understanding MAG's structure-function relationship.
- The results support the hypothesis that glycosylation is critical for MAG's role and L2/HNK-1 epitope expression.