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Human-IgG-Neutralizing Monoclonal Antibodies Block the SARS-CoV-2 Infection #MMPMID32668215
Wan J; Xing S; Ding L; Wang Y; Gu C; Wu Y; Rong B; Li C; Wang S; Chen K; He C; Zhu D; Yuan S; Qiu C; Zhao C; Nie L; Gao Z; Jiao J; Zhang X; Wang X; Ying T; Wang H; Xie Y; Lu Y; Xu J; Lan F
Cell Rep 2020[Jul]; 32 (3): 107918 PMID32668215show ga
Coronavirus disease 2019 (COVID-19) has become a worldwide threat to humans, and neutralizing antibodies have therapeutic potential. We have purified more than 1,000 memory B cells specific to SARS-CoV-2 S1 or its RBD (receptor binding domain) and obtain 729 paired heavy- and light-chain fragments. Among these, 178 antibodies test positive for antigen binding, and the majority of the top 17 binders with EC(50) below 1 nM are RBD binders. Furthermore, we identify 11 neutralizing antibodies, eight of which show IC(50) within 10 nM, and the best one, 414-1, with IC(50) of 1.75 nM. Through epitope mapping, we find three main epitopes in RBD recognized by these antibodies, and epitope-B antibody 553-15 could substantially enhance the neutralizing abilities of most of the other antibodies. We also find that 515-5 could cross neutralize the SARS-CoV pseudovirus. Altogether, our study provides 11 potent human neutralizing antibodies for COVID-19 as therapeutic candidates.