9UV4 | pdb_00009uv4

Structure of MHV68 glycoprotein B in complex with Fab5

• PDB DOI: https://doi.org/10.2210/pdb9UV4/pdb
• EM Map EMD-64523: EMDB EMDataResource

• Classification: VIRAL PROTEIN/IMMUNE SYSTEM
• Organism(s): Mus musculus, Murid herpesvirus 68
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2025-05-09 Released: 2026-01-21 
• Deposition Author(s): Cheng, B.Z., Fang, X.Y., Xie, C., Sun, C., Liu, Z., Zeng, M.S.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

A broadly protective antibody targeting gammaherpesvirus gB.

Sun, C., Xie, C., Cheng, B.Z., Jiang, Z.Y., Wu, P.H., Fang, X.Y., Li, P.L., Tian, X.S., Zhou, H., Yang, Y.L., Wang, J., Sui, S.F., Liu, Z., Zeng, M.S.

(2026) Nature 653: 190-199

• PubMed: 41629701 
• DOI: https://doi.org/10.1038/s41586-026-10192-5
• Primary Citation Related Structures: 
  9UV4, 9UVC, 9UY9


• PubMed Abstract: 
  

  Gammaherpesvirus is a subfamily of herpesvirus, distinct phylogenetically from alpha- and betaherpesvirus and featured by its oncogenic subtypes, including Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus ¹ . It broadly infects humans and other vertebrate animals and causes various diseases and malignancies ^2,3 . However, no specific antiviral agents are available for each type or the whole family. gB is the common fusion protein vital for herpesvirus infection and an ideal target for broad vaccine development, while the lack of basis for gB as a universal antigen hinders such effort ⁴ . Here, we report the molecular basis for broad gB binding and cross-genus virus neutralization by an antibody Fab5 for the first time. This antibody confers effective protection against authentic virus challenges in immune-competent mice, non-human primates, and humanized mice with murine, rhesus, and human gammaherpesvirus. Cryo-EM structures revealed that Fab5 targeted a conservative and vulnerable epitope of gammaherpesvirus gB and antigenically exposed across pre- or post-fusion status. This finding not only demonstrates Fab5 as cross-genus antibody broadly reactive against gammaherpesvirus infection and pathogenesis progression, but offers insights into potential common mechanisms for herpesvirus infection and facilitates the development of broad-spectrum vaccines against the gammaherpesvirus.

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Organizational Affiliation: 
• State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China. [e-mail].
State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China.
Cryo-electron Microscopy Center and Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen, Guangdong, China.
Cryo-electron Microscopy Center and Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen, Guangdong, China. [e-mail].
State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China. [e-mail].

Biological Assembly 1  

Global Symmetry: Cyclic - C3  (Explore in 3D)
Global Stoichiometry: Hetero 9-mer - A3B3C3 Pseudo Symmetry: Cyclic - C3  (Explore in 3D)
Pseudo Stoichiometry: Hetero 9-mer - A6B3 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 367.14 kDa 
• Atom Count: 15,814 
• Modeled Residue Count: 2,280 
• Deposited Residue Count: 3,285 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fab 5 H chain	A [auth I], C [auth J], E [auth K]	224	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Fab5 L chain	B [auth M], D [auth N], F [auth O]	213	Mus musculus	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
MHV 68 glycoprotein B	G [auth A], H [auth B], I [auth C]	658	Murid herpesvirus 68	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-01-21 
Deposition Author(s): Cheng, B.Z., Fang, X.Y., Xie, C., Sun, C., Liu, Z., Zeng, M.S.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	82030046

Revision History  

• Version 1.0: 2026-01-21
  Type: Initial release
  
• Version 1.1: 2026-02-18
  Changes: Data collection, Database references
• Version 1.2: 2026-04-08
  Changes: Data collection, Structure summary
• Version 1.3: 2026-05-20
  Changes: Data collection, Database references