Patent ID: 8722366

Claim:
A method for synthesizing poly-N-acetyllactosamine sugar chain (Galβ1-4GlcNAcβ1-3) n Galβ1-4GlcNAc (n=1 or more), comprising the step of: introducing DNA or RNA into a cell comprising a GlcNAc β1,4-galactosyltransferase, wherein said cell comprises an acceptor substrate selected from the group consisting of i) N-acetyllactosamine (Galβ1-4GlcNAc), ii) an oligosaccharide having an N-acetyllactosamine structure at its non-reducing end, and iii) a complex carbohydrate having an N-acetyllactosamine structure at its non-reducing terminal, wherein said DNA or RNA encodes a polypeptide having β1,3-N-acetylglucosaminyltransferase activity capable of transferring N-acetylglucosamine to a galactose residue present in the non-reducing terminal of said acceptor substrate via a β1,3-linkage selected from the group consisting of the following (a), (b), (c) and (d): (a) a DNA comprising the nucleotide sequence of positions 234-1424 of SEQ ID NO:5; (b) a DNA comprising the nucleotide sequence of positions 354-1424 of SEQ ID NO:5; (c) a DNA hybridizing with (a) or (b) at 65° C. in the presence of 0.7 to 1.0 M sodium chloride followed by washing at 65° C. with 0.1 to 2-fold concentrated SSC solution (1-fold concentrated SSC solution contains 150 mM sodium chloride and 15 mM sodium citrate); and d) an RNA comprising a sequence corresponding to the DNA selected from any one of (a) to (c); culturing the cell to express the polypeptide and recovering the poly-N-acetyllactosamine sugar chain produced.