9U74

Respiratory Syncytial Virus pre-F trimer bound by neutralizing antibody PR306007

This is a non-PDB format compatible entry.

Summary for 9U74

• Entry DOI: 10.2210/pdb9u74/pdb
• EMDB information: 63931
• Descriptor: Fusion glycoprotein F2, Fusion glycoprotein F1, PR306007 Light chain protein, ... (4 entities in total)
• Functional Keywords: rsv, pre-f, neutralizing antibody, immune system (includes antibodies, antigens), structural protein-immune system complex, structural protein/immune system
• Biological source: Respiratory syncytial virus A2; More
• Total number of polymer chains: 8
• Total formula weight: 185855.26

Authors

Zheng, Z.,Zixian, S.,Rui, F.,Yu, G. (deposition date: 2025-03-24, release date: 2025-11-12, Last modification date: 2025-12-03)

Primary citation

Zhang, Z.,Feng, R.,Zhang, L.,Yang, Q.,Chen, X.,Wang, X.,Nie, C.,Peng, W.,Wang, X.,Zhu, L.,Guo, Y.,Sun, Z.
Discovery and molecular mechanism of potent neutralizing antibody from humanized mice with respiratory syncytial virus.
Plos Pathog., 21:-, 2025

PubMed Abstract: Respiratory syncytial virus (RSV) is a leading cause of lower respiratory tract infections among infants and older adults, posing a significant threat to global public health. The prophylactic use of neutralizing antibodies (nAbs) underscores the need to understand elite RSV antibody neutralization mechanisms, which is fundamental for developing next-generation therapies with enhanced potency and broader activity. In this study, we utilized H2L2 transgenic mice encoding human immunoglobulin variable regions for immunization and successfully screened multiple antibodies with significant neutralizing activity using the Beacon Optofluidic system. One of these antibodies, PR306007, exhibited significantly superior broad-spectrum neutralization against both RSV-A and B subgroups. Cryo-electron microscopy (Cryo-EM) structural analysis revealed that PR306007 binds to a unique epitope that overlaps with antigenic sites II and V of the F protein, with its primary binding regions located at the base of the α6 and α7 helices of site II, and residues S173 and N175 of site V. This binding mode offers valuable insights into enhanced neutralization activity and potentially reduces the risk of emerging immune evasive mutants. Furthermore, PR306007 showed potent in vivo antiviral activity against RSV infection and demonstrated good efficacy against both lower and upper respiratory tract infections, making it a promising prophylactic candidate for broad prevention. These findings provide new insights for the future development of RSV vaccines or nAbs.

PubMed: 41248206
DOI: 10.1371/journal.ppat.1013674

Experimental method

ELECTRON MICROSCOPY (4.08 Å)