Epitope Mapping of an Anti-Human EGFR Monoclonal Antibody (EMab-51) using the REMAP Method
Epitope Mapping of an Anti-Human EGFR Monoclonal Antibody (EMab-51) using the REMAP Method
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使用 REMAP 方法对抗人 EGFR 单克隆抗体 (EMab-51) 进行表位作图
DOI:
10.1089/mab.2021.0010
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Kato Y.
中科院分区:
文献类型:
--
作者:
Nanamiya R;Sano M;Asano T;Yanaka M;Nakamura T;Saito M;Tanaka T;Hosono H;Tateyama N;Kaneko MK;Kato Y.
The classic method for identifying the epitope that monoclonal antibodies (mAbs) bind uses deletion mutants and point mutants of the target protein. However, determining the epitope of mAbs-reactive membrane proteins is often challenging. We recently developed the RIEDL insertion for epitope mapping (REMAP) method to identify mAb-binding epitopes. Herein, we first checked the reactivity of an anti-epidermal growth factor receptor (EGFR) mAb (EMab-51) to several EGFR deletion mutants such as EGFR/dN152, EGFR/dN313, EGFR/dN370, EGFR/dN375, EGFR/dN380, and EGFR/dN482. We found the N-terminus of the EMab-51-binding epitope between residues 375 and 380 of EGFR. We next produced EGFR/dN313 mutants with the RIEDL peptide tag inserted at each possible position of375-AFRGDSFTHTPPLDP-389. EMab-51 lost its reactivity with the mutants having a RIEDL tag inserted at each position of377-RGDSFTHTPP-386, whereas LpMab-7 (an anti-RIEDL mAb) detected every mutant. Thus, using the REMAP method, we identified the EMab-51-binding epitope of EGFR as377-RGDSFTHTPP-386.