Cryoelectron microscopy structures of a human neutralizing antibody bound to MERS-CoV spike glycoprotein.
Zhang, S., Jia, W., Zeng, J., Li, M., Wang, Z., Zhou, H., Zhang, L., Wang, X.(2022) Front Microbiol 13: 988298-988298
- PubMed: 36246239
- DOI: https://doi.org/10.3389/fmicb.2022.988298
- Primary Citation of Related Structures:
7X25, 7X26, 7X28, 7X29, 7X2A - PubMed Abstract:
Neutralizing monoclonal antibodies (mAbs) against highly pathogenic coronaviruses represent promising candidates for clinical intervention. Here, we isolated a potent neutralizing monoclonal antibody, MERS-S41, from a yeast displayed scFv library using the S protein as a bait. To uncover the neutralization mechanism, we determined structures of MERS-S41 Fab in complex with the trimeric spike glycoprotein by cryoelectron microscopy (cryo-EM). We observed four distinct classes of the complex structure, which showed that the MERS-S41 Fab bound to the "up" receptor binding domain (RBD) with full saturation and also bound to an accessible partially lifted "down" RBD, providing a structural basis for understanding how mAbs bind to trimeric spike glycoproteins. Structure analysis of the epitope and cell surface staining assays demonstrated that virus entry is blocked predominantly by direct competition with the host receptor, dipeptidyl peptidase-4 (DPP4).
Organizational Affiliation:
The Ministry of Education Key Laboratory of Protein Science, Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, China.