申请人:Tosoh Corporation
公开号:EP3517609A1
公开(公告)日:2019-07-31
The problem to be addressed by the present invention is to provide improved recombinant FcγRIIb and FcγRIIa that do not require refolding and exhibit high productivity and thermal stability, and to provide a method for producing the same. Said problem is solved by improved recombinant FcγRIIb comprising at least the amino acid residues of the extracellular domain of human FcγRIIb (No. 43 to No. 215 in UniProt No. P31994), wherein, in said amino acid residues, at least one amino acid substitution has occurred at a position corresponding to No. 82, 94, 98, 104, 105, or 139 in UniProt No. P31994. Said problem is also solved by improved recombinant FcγRIIa comprising at least the amino acid residues of the extracellular domain of human FcγRIIa (No. 34 to No. 206 in UniProt No. P12318-1), wherein, in said amino acid residues, at least one amino acid substitution has occurred at a position corresponding to No. 73, 85, 89, 95, 96, or 130 in UniProt No. P12318-1.
本发明要解决的问题是提供改进的重组 FcγRIIb 和 FcγRIIa,它们不需要重折叠,并表现出高生产率和热稳定性,并提供生产它们的方法。上述问题通过改进的重组 FcγRIIb 得到解决,该重组 FcγRIIb 至少包含人 FcγRIIb 细胞外结构域(UniProt 编号 P31994 中的第 43 号至第 215 号)的氨基酸残基,其中,在所述氨基酸残基中,至少有一个氨基酸在与 UniProt 编号 P31994 中的第 82 号、第 94 号、第 98 号、第 104 号、第 105 号或第 139 号相对应的位置发生了取代。改进的重组 FcγRIIa 也解决了上述问题,该重组 FcγRIIa 至少包含人 FcγRIIa 细胞外结构域的氨基酸残基(UniProt 编号 P12318-1 中的第 34 号至第 206 号),其中,在所述氨基酸残基中,至少一个氨基酸取代发生在与 UniProt 编号 P12318-1 中的第 73 号、第 85 号、第 89 号、第 95 号、第 96 号或第 130 号相对应的位置上。