Modified lectin derived from Wisteria floribunda

摘要

A Wisteria floribunda monomeric lectin polypeptide is provided. The Wisteria floribunda monomeric lectin polypeptide includes any one of the amino acid sequences selected from the group consisting of: (1) the amino acid sequence represented by SEQ ID NO: 2; (2) the amino acid sequence defined in (1) above, except that one to 20 amino acids at positions other than Cys272 position is/are deleted, substituted, inserted, or added; and (3) the amino acid sequence defined in (1) or (2) above, further having an N-terminus deletion of one to 30 amino acids, in which Cys272 is alkylated, and the polypeptide is capable of specifically binding to a GalNAc terminal sugar chain.