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An N-linked sugar chain from 55-kDa royal jelly glycoprotein (RJGP), which maintains the high viability of rat liver primary cultured cell and is a different molecular species from 350-kDa RJGP [Kimura et al., Biosci. Biotech. Biochem., 59, 507-509 (1995)], has been identified. The sugar chains were released by hydrazinolysis followed by N-acetylation and pyridylamination. The structural analysis of the pyridylaminated sugar chain was done by a combination of sequential exo-mannosidase digestions, MALDI-TOF MS, and 500 MHz 1H-NMR. For the carbohydrate moiety of 55-kDa RJGP, only one N-linked sugar chain has been detected. The structure has been found to be Man alpha 1--&gt;2Man alpha 1--&gt;6(Man alpha 1--&gt; 2Man alpha 1--&gt;3)Man alpha 1--&gt;6(Man alpha 1--&gt;2Man alpha 1--&gt;2Man alpha 1--&gt;3)Man beta 1--&gt;4GlcNAc beta 1--&gt;4GlcNAc, which is a non-processed high mannose type structure.

N-Linked Sugar Chain of 55-kDa Royal Jelly Glycoprotein