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In our previous paper (Kimura, Y., et al., Biosci. Biotechnol. Biochem., 67, 1852-1856, 2003), we found that a complex type N-glycans containing beta1-3 galactose residue occurs on royal jelly glycoproteins. During structural analysis of minor components of royal jelly N-glycans, we found complex type N-glycans bearing both galactose and N-acetylgalactosamine residues. Detailed structural analysis of pyridylaminated oligosaccharide revealed that the newly found N-glycan had a complex type structure harboring a tumor marker (T-antigen) unit: Galbeta1-3GalNAcbeta1-4GlcNAcbeta1-2Manalpha1-6 (Galbeta1-3GalNAcbeta1-4GlcNAcbeta1-2Manalpha1-3) Manbeta1-4GlcNAcbeta1-4GlcNAc. To our knowledge, this may be the first report of the presence of the T-antigen unit in the N-glycan moiety of eucaryotic glycoproteins.

Tumor Antigen Occurs inN-Glycan of Royal Jelly Glycoproteins: Honeybee Cells Synthesize T-Antigen Unit inN-Glycan Moiety