9VHZ | pdb_00009vhz

Structure of MPXV M1R and hmMM1-40 Fab complex

• PDB DOI: https://doi.org/10.2210/pdb9VHZ/pdb

• Classification: VIRAL PROTEIN/IMMUNE SYSTEM
• Organism(s): Mus musculus, Monkeypox virus
• Expression System: Homo sapiens, Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2025-06-17 Released: 2025-10-01 
• Deposition Author(s): Zhao, R.C., Zhang, Y., Wu, L.L., Wang, Q.H.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 
  0.296 (Depositor), 0.292 (DCC) 
• R-Value Work: 
  0.207 (Depositor), 0.207 (DCC) 
• R-Value Observed: 
  0.212 (Depositor) 

Starting Models: experimental

Literature

Anti-M1R/B6R antibody characterization and bispecific design for enhanced orthopoxvirus protection.

Zhao, R., Wu, L., Zhang, Y., Ma, J., Liu, D., Zheng, Y., Kong, T., Ma, R., Gao, Z., Chai, Y., Liu, Y., Tian, Y., Xia, Y., Hou, Y., Lu, J., Cong, Z., Huang, B., Tan, W., Xue, J., Gao, G.F., Wang, Q.

(2025) EMBO Mol Med 17: 2713-2734

• PubMed: 40921877 
• DOI: https://doi.org/10.1038/s44321-025-00299-z
• Primary Citation of Related Structures:  
  9LF8, 9VHZ


• PubMed Abstract: 
  

  The global outbreak of the mpox in humans, caused by the mpox virus (MPXV), underscores the urgent need for safe and effective therapeutics. In this study, we characterized the dominant MPXV immunogens, M1R and B6R, by sequencing monoclonal antibodies (MAbs) from the immunized mice and analyzing their epitopes and functions through in vitro and in vivo assessments of binding and antiviral activities. Several broadly effective anti-M1R and anti-B6R neutralizing MAbs were identified and they exhibited enhanced antiviral effects against MPXV or vaccinia virus (VACV) when used in antibody cocktail and bispecific antibody designs. Notably, the VH-CH1 switch region-inserting format of bispecific antibodies exhibited robust protective efficacy against VACV in a mouse model. Collectively, our study characterized the epitope and functional maps of anti-M1R and anti-B6R MAbs and developed promising broad-spectrum antibody candidates for the treatment of MPXV and other orthopoxvirus infections.

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Organizational Affiliation: 
• Institute of Physical Science and Information, Anhui University, 230039, Hefei, Anhui, China.
CAS Key Laboratory of Pathogen Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), 100101, Beijing, China.
State Key Laboratory of Respiratory Health and Multimorbidity, NHC Key Laboratory of Human Disease Comparative Medicine, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences and Peking Union Medical College, 100021, Beijing, China.
Human Phenome Institute, Minhang Hospital, Fudan University, 201203, Shanghai, China.
School of Medicine, Tsinghua University, 100190, Beijing, China.
Shenzhen Children's Hospital, 518000, Shenzhen, China.
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, 518055, Shenzhen, China.
Wuhan Institute of Biological Products Co., Ltd., 430207, Wuhan, China.
NHC Key Laboratory of Biosafety, National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, 102206, Beijing, China.
State Key Laboratory of Respiratory Health and Multimorbidity, NHC Key Laboratory of Human Disease Comparative Medicine, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences and Peking Union Medical College, 100021, Beijing, China. [e-mail].
Institute of Physical Science and Information, Anhui University, 230039, Hefei, Anhui, China. [e-mail].
CAS Key Laboratory of Pathogen Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), 100101, Beijing, China. [e-mail].
Medical School, University of Chinese Academy of Sciences, 101408, Beijing, China. [e-mail].

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.

Macromolecule Content 

• Total Structure Weight: 69.34 kDa 
• Atom Count: 4,629 
• Modeled Residue Count: 606 
• Deposited Residue Count: 637 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
hmMM1-40 Fab heavy chain	A	236	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
hmMM1-40 Fab light chain	B	220	Mus musculus	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Entry-fusion complex associated protein OPG095	C [auth Q]	181	Monkeypox virus	Mutation(s): 0  Gene Names: OPG099, MPXVgp080
UniProt
Find proteins for M1LBP0 (Monkeypox virus) Explore M1LBP0  Go to UniProtKB:  M1LBP0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free:  0.296 (Depositor), 0.292 (DCC) 
• R-Value Work:  0.207 (Depositor), 0.207 (DCC) 
• R-Value Observed: 0.212 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 61.361	α = 90
b = 72.353	β = 90
c = 170.587	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-10-01 
Deposition Author(s): Zhao, R.C., Zhang, Y., Wu, L.L., Wang, Q.H.

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

Revision History  

• Version 1.0: 2025-10-01
  Type: Initial release
  
• Version 1.1: 2025-10-29
  Changes: Database references