| 摘要 |
A glycopeptide having at least one asparagine-linked oligosaccharide at a desired position of the peptide chain thereof, which is obtained by: (1) esterifying a hydroxyl group of a resin having the hydroxyl group and a carboxyl group of an amino acid having amino group nitrogen protected with a fat-soluble protective group, (2) removing the fat-soluble protective group to form a free amino group, (3) amidating the free amino group and a carboxyl group of an amino acid having amino group nitrogen protected with a fat-soluble protective group, (4) removing the fat-soluble protective group to form a free amino group, (5) repeating the steps (3) and (4) at least once, (6) amidating the free amino group and a carboxyl group of the asparagine portion of an asparagine-linked oligosaccharide having amino group nitrogen protected with a fat-soluble protective group, (7) removing the fat-soluble protective group to form a free amino group, (8) amidating the free amino group and a carboxyl group of an amino acid having amino group nitrogen protected with a fat-soluble protective group, (9) repeating the steps (7) and (8) at least once, (10) removing the fat-soluble protective group to form a free amino group, and (11) cutting off the resin with an acid; glycopeptide obtained by transferring sialic acid or a derivative thereof to the above glycopeptide using a sialic acid transferase.
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