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Journal of Lipid Research, Vol 28, 450-454, Copyright © 1987 by Lipid Research, Inc.

ARTICLES

Structural study of the asparagine-linked oligosaccharides of lipophorin in locusts

E Nagao and H Chino

The complete structure of oligosaccharides from locust lipophorin was studied. The asparagine-linked oligosaccharides were first liberated from the protein moiety of lipophorin by digestion with almond glycopeptidase (N-oligosaccharide glycopeptidase, EC 3.5.1.52). Two major oligosaccharides (E and F), separated by subsequent thin-layer chromatography, were analyzed by methylation analysis and 1H-NMR. Based on the experimental data, the whole structure of oligosaccharide E was identified as Man alpha 1----2Man alpha 1----6(Man alpha 1----2Man alpha 1----3) Man alpha 1----6(Man alpha 1----2Man alpha 1----2Man alpha 1----3)Man beta 1----4GlcNAc beta 1----4GlcNAc. The data also revealed that oligosaccharide F is identical with oligosaccharide E in the structure, except for one glucose residue that is linked to the nonreducing terminal Man alpha 1----2 residue.
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