Method for producing oligosaccharide having lewis x skeleton

A microorganism having an enhanced activity of a protein according to any one of the following [1] to [6] and improved productivity of an oligosaccharide having a Lewis X skeleton as compared with a parent strain:

• [1] a protein consisting of the amino acid sequence represented by SEQ ID NO:
• 2,
• [2] a mutant protein having an α1,3-fucosyltransferase activity and consisting of an amino acid sequence in which 1 to 20 amino acids are deleted, substituted, inserted, or added in the amino acid sequence represented by SEQ ID NO:
• 2,
• [3] a homologous protein having an α1,3-fucosyltransferase activity and consisting of an amino acid sequence having an identity of 90% or more with the amino acid sequence represented by SEQ ID NO:
• 2,
• [4] a protein consisting of the amino acid sequence represented by SEQ ID NO:
• 24,
• [5] a protein consisting of the amino acid sequence represented by SEQ ID NO:
• 18, and
• [6] a protein consisting of the amino acid sequence represented by SEQ ID NO:
• 26.