期刊
FRONTIERS IN IMMUNOLOGY
卷 13, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2022.960094
关键词
SARS-CoV-2; hACE2; 2xS-RBD-mFc; Vaccine; viral infection
类别
The study shows that the fusion protein of the receptor-binding domain (S-RBD) of SARS-CoV-2 can bind ACE2 and block viral infection. Immunization with this fusion protein in mice produces highly effective neutralizing antibodies, indicating its potential as a treatment and preventive measure against COVID-19.
The pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has posed serious threats to global health and economy and calls for the development of safe treatments and effective vaccines. The receptor-binding domain in the spike protein (S-RBD) of SARS-CoV-2 is responsible for its binding to angiotensin-converting enzyme 2 (ACE2) receptor. It contains multiple dominant neutralizing epitopes and serves as an important antigen for the development of COVID-19 vaccines. Here, we showed that dimeric S-RBD-Fc and tetrameric 2xS(RBD)-Fc fusion proteins bind ACE2 with different affinity and block SARS-CoV-2 pseudoviral infection. Immunization of mice with S-RBD-Fc fusion proteins elicited high titer of RBD-specific antibodies with robust neutralizing activity against pseudoviral infections. As such, our study indicates that the polymeric S-RBD-Fc fusion protein can serve as a treatment agent as well as a vaccine for fighting COVID-19.
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