7N0V image
Deposition Date 2021-05-26
Release Date 2021-08-11
Last Version Date 2024-11-06
Entry Detail
PDB ID:
7N0V
Keywords:
Title:
Complex of recombinant Bet v 1 with Fab fragment of REGN5715
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Betula pendula (Taxon ID: 3505)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.71 Å
R-Value Free:
0.37
R-Value Work:
0.32
R-Value Observed:
0.32
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Major pollen allergen Bet v 1-A
Gene (Uniprot):BETVIA
Mutations:F63L
Chain IDs:C
Chain Length:187
Number of Molecules:1
Biological Source:Betula pendula
Polymer Type:polypeptide(L)
Molecule:REGN5715 Fab heavy chain
Chain IDs:A (auth: H)
Chain Length:225
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:REGN5715 Fab light chain
Chain IDs:B (auth: L)
Chain Length:215
Number of Molecules:1
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
Targeting immunodominant Bet v 1 epitopes with monoclonal antibodies prevents the birch allergic response.
J.Allergy Clin.Immunol. 149 200 211 (2022)
PMID: 34126155 DOI: 10.1016/j.jaci.2021.05.038

Abstact

BACKGROUND Blocking the major cat allergen, Fel d 1, with mAbs was effective in preventing an acute cat allergic response. OBJECTIVES This study sought to extend the allergen-specific antibody approach and demonstrate that a combination of mAbs targeting Bet v 1, the immunodominant and most abundant allergenic protein in birch pollen, can prevent the birch allergic response. METHODS Bet v 1-specific mAbs, REGN5713, REGN5714, and REGN5715, were isolated using the VelocImmune platform. Surface plasmon resonance, x-ray crystallography, and cryo-electron microscopy determined binding kinetics and structural data. Inhibition of IgE-binding, basophil activation, and mast cell degranulation were assessed via blocking ELISA, flow cytometry, and the passive cutaneous anaphylaxis mouse model. RESULTS REGN5713, REGN5714, and REGN5715 bind with high affinity and noncompetitively to Bet v 1. A cocktail of all 3 antibodies, REGN5713/14/15, blocks IgE binding to Bet v 1 and inhibits Bet v 1- and birch pollen extract-induced basophil activation ex vivo and mast cell degranulation in vivo. Crystal structures of the complex of Bet v 1 with immunoglobulin antigen-binding fragments of REGN5713 or REGN5715 show distinct interaction sites on Bet v 1. Cryo-electron microscopy reveals a planar and roughly symmetrical complex formed by REGN5713/14/15 bound to Bet v 1. CONCLUSIONS These data confirm the immunodominance of Bet v 1 in birch allergy and demonstrate blockade of the birch allergic response with REGN5713/14/15. Structural analyses show simultaneous binding of REGN5713, REGN5714, and REGN5715 with substantial areas of Bet v 1 exposed, suggesting that targeting specific epitopes is sufficient to block the allergic response.

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Primary Citation of related structures