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Previous studies have shown that the majority of the asparagine-linked high mannose oligosaccharide units present on the lysosomal enzymes of the slime mold Dictyostelium discoideum contain mannose 6-sulfate and mannose 6-phosphate residues, the latter being diesterified to methyl groups. Using a variety of techniques, including NMR spectroscopy and fast atom bombardment mass spectrometry, we have found that many of these oligosaccharides also contain an N-acetylglucosamine residue linked beta 1-4 to the mannose residue linked alpha 1-6 to the beta-linked core mannose. (Formula: see text) As far as we are aware, this is the first description of an intersecting N-acetylglucosamine residue in this position on a high mannose oligosaccharide.
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