9UEV | pdb_00009uev

Structure of the SFTSV Gn head protein in complex with Nb261 and Nb318

• PDB DOI: https://doi.org/10.2210/pdb9UEV/pdb
• EM Map EMD-64093: EMDB EMDataResource

• Classification: VIRAL PROTEIN/IMMUNE SYSTEM
• Organism(s): Severe fever with thrombocytopenia syndrome virus, Vicugna pacos
• Expression System: Homo, Escherichia coli
• Mutation(s): No 


• Deposited: 2025-04-09 Released: 2025-10-29 
• Deposition Author(s): Liang, S.J., Lou, Z.Y., Wu, X.L.
• Funding Organization(s): National Science Foundation (NSF, China)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.62 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

A rationally designed cocktail of nanobodies elicited by heterologous vaccination confers protection against SFTSV in preclinical models.

Wu, X., Zhu, L., Liang, S., Chang, Z., Wang, Y., Zou, Q., Xu, Z., Zhang, D., Hu, J., Geng, S., Li, Z., Yu, W., Hu, Z., Chen, M., Cao, K., Jia, B., Wei, H., Cai, R., Long, J., Yang, X., Yang, Q., Yu, Z., Shi, L., Xu, B., Zheng, Y., Meng, S., Cai, J., Zhou, G., Zhu, K., Dou, Y., Lou, Z., Li, M., Wu, Y., Wu, Z.

(2025) Sci Transl Med 17: eady9025-eady9025

• PubMed: 41259535 
• DOI: https://doi.org/10.1126/scitranslmed.ady9025
• Primary Citation Related Structures: 
  9UB6, 9UEV


• PubMed Abstract: 
  

  Severe fever with thrombocytopenia syndrome virus (SFTSV), an emerging tick-borne phlebovirus, poses a growing public health threat, with no approved vaccines or targeted therapies. Its genetic diversity and rapid reassortment have hindered the development of broadly effective interventions. Here, we isolated and characterized broadly neutralizing camelid nanobodies generated by a heterologous immunization strategy. These nanobodies exhibited cross-subtype neutralization and conferred protection against disease in humanized and lethal murine models of SFTSV infection. Structural analysis revealed binding to distinct, nonoverlapping epitopes on the viral glycoprotein complex. A rationally designed cocktail leveraging this epitope diversity achieved complete viral inhibition through synergistic mechanisms. In both murine and immunocompetent ferret models, the cocktail enabled efficient viral clearance and full protection against lethal challenge. These results demonstrate the therapeutic potential of nanobody cocktails for SFTSV infection and establish a generalizable framework for nanobody-based countermeasures against genetically variable emerging viruses, including other members of the Bunyavirales order.

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Organizational Affiliation: 
• Center for Public Health Research, Medical School, Nanjing University, Nanjing 210093, China.
State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing 210023, China.
Jiangsu Key Laboratory of Molecular Medicine, Medical School, Nanjing University, Nanjing 210093, China.
Abrev Biotechnology Co. Ltd., Nanjing 210093, China.
MOE Key Laboratory of Protein Science, School of Medicine, Tsinghua University, Beijing 100084, China.
Department of Pathogen Microbiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China.
Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures, School of Life Sciences, Tianjin University, Tianjin 300072, China.
Kunming National High-level Biosafety Research Center for Non-Human Primates, Kunming Institute of Zoology, Chinese Academy of Sciences, Yunnan 650201, China.
Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230027, China.
MOE Key Laboratory of Model Animals for Disease Study, Medical School, Nanjing University, Nanjing 210061, China.
Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China.
Department of Intensive Care Unit, the Affiliated Drum Tower Hospital, Medical School, Nanjing University, Nanjing 210008, China.
Department of Infectious Disease, Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing 211113, China.
Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.
Department of Infectious Diseases, the Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China.
Yunnan Provincial Key Laboratory of Entomological Biopharmaceutical R&D, College of Pharmacy, Dali University, Dali, Yunnan 671003, China.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 3-mer - A2B1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 61.41 kDa 
• Atom Count: 4,297 
• Modeled Residue Count: 559 
• Deposited Residue Count: 559 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SFTSV Gn head	A	321	Severe fever with thrombocytopenia syndrome virus	Mutation(s): 0
UniProt
Find proteins for A0A8F5LQV3 (Dabie bandavirus) Explore A0A8F5LQV3  Go to UniProtKB:  A0A8F5LQV3

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Nb261	B	115	Vicugna pacos	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Nb318	C	123	Vicugna pacos	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.62 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-10-29 
Deposition Author(s): Liang, S.J., Lou, Z.Y., Wu, X.L.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, China)	China	--

Revision History  

• Version 1.0: 2025-10-29
  Type: Initial release
  
• Version 1.1: 2026-09-09
  Changes: Data collection, Database references