Disclosed is a full-length IgG-Fc fragment having a substantially homogeneous sugar chain added thereto. Also disclosed is a process for producing the full-length IgG-Fc fragment. Specifically disclosed is an IgG-Fc fragment having a sugar chain added thereto, in which the sugar chain is added to the same position as that in a naturally occurring IgG-Fc fragment, any one amino acid residue selected from 1st to 30th amino acid residues from the sugar chain-added amino acid residue on the N-terminal side of the sugar chain-added amino acid residue is substituted by a Cys residue and at least one Met residue is substituted by an amino acid residue other than a Met residue. Also specifically disclosed is a process for producing the IgG-Fc fragment.
本发明公开了一种全长 IgG-Fc 片段,该片段中添加了基本均匀的糖链。还公开了一种生产全长 IgG-Fc 片段的工艺。具体公开了一种具有糖链的 IgG-Fc 片段,其中糖链被添加到与天然存在的 IgG-Fc 片段中相同的位置,在糖链添加的
氨基酸残基的 N 端侧,从糖链添加的
氨基酸残基的第 1 至 30 个
氨基酸残基中任选一个
氨基酸残基被 Cys 残基取代,至少一个 Met 残基被 Met 残基以外的
氨基酸残基取代。还特别公开了一种生产IgG-Fc片段的工艺。