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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Synapsins contain O-linked N-acetylglucosamine.

The neuron-specific synaptic vesicle-associated phosphoproteins synapsin I and synapsin II were shown to contain terminal N-acetylglucosamine (GlcNAc) residues as determined by specific labeling with bovine galactosyltransferase and UDP-[3H]galactose. The beta-elimination of galactosyltransferase radiolabeled synapsin I and subsequent analysis of released saccharide on high-voltage paper electrophoresis confirmed the presence of monosaccharidic GlcNAc moieties in O-linkage to the protein. Partial cleavage of synapsin I by collagenase, 2-nitro-5-thiocyanobenzoic acid, and Staphylococcus aureus V8 protease suggests that at least three glycosylation sites exist along the molecule. Taken together these data present the first evidence that a neuron-specific protein contains O-glycosidically bound GlcNAc.[1]


  1. Synapsins contain O-linked N-acetylglucosamine. Lüthi, T., Haltiwanger, R.S., Greengard, P., Bähler, M. J. Neurochem. (1991) [Pubmed]
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