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Synapsins contain O-linked N-acetylglucosamine.

T Lüthi1, R S Haltiwanger, P Greengard

  • 1Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, New York 10021.

Journal of Neurochemistry
|May 1, 1991
PubMed
Summary
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Synapsins I and II, neuron-specific phosphoproteins, contain terminal N-acetylglucosamine (GlcNAc) residues. This O-glycosylation is the first evidence of such modification in neuron-specific proteins.

Area of Science:

  • Neuroscience
  • Glycobiology
  • Molecular Biology

Background:

  • Synapsins I and II are neuron-specific phosphoproteins crucial for synaptic vesicle regulation.
  • Understanding protein modifications in neurons is key to deciphering neural function.

Purpose of the Study:

  • To investigate the presence and nature of carbohydrate residues on synapsins I and II.
  • To identify potential glycosylation sites on synapsin I.

Main Methods:

  • Enzymatic labeling with galactosyltransferase and UDP-[3H]galactose.
  • Beta-elimination and high-voltage paper electrophoresis for saccharide analysis.
  • Proteolytic cleavage (collagenase, NBS, S. aureus V8 protease) to map glycosylation sites.

Main Results:

Related Experiment Videos

  • Terminal N-acetylglucosamine (GlcNAc) residues were identified on synapsins I and II.
  • GlcNAc moieties were confirmed to be in O-linkage to the protein.
  • At least three potential glycosylation sites were suggested by protease digestion patterns.

Conclusions:

  • This study provides the first evidence of O-glycosidically bound N-acetylglucosamine in a neuron-specific protein.
  • The findings expand our understanding of post-translational modifications in neuronal proteins.