9MEV | pdb_00009mev

Experimental Data Snapshot

Starting Models: experimental
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wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.0 of the entry. See complete history.

(2025) bioRxiv

PubMed Abstract:
Antigenic variability among influenza virus strains poses a significant challenge to developing broadly protective, long-lasting vaccines. Current annual vaccines target specific strains, requiring accurate prediction for effective neutralization. Despite sequence diversity across phylogenetic groups, the hemagglutinin (HA) head domain's structure remains highly conserved. Utilizing this conservation, we designed cross-group chimeric HAs that combine antigenic surfaces from distant strains. By structure-guided transplantation of receptor-binding site (RBS) residues, we displayed an H3 RBS on an H1 HA scaffold. These chimeric immunogens elicit cross-group polyclonal responses capable of neutralizing both base and distal strains. Additionally, the chimeras integrate heterotrimeric immunogens, enhancing modular vaccine design. This approach enables the inclusion of diverse strain segments to generate broad polyclonal responses. In the future, such modular immunogens may serve as tools for evaluating immunodominance and refining immunization strategies, offering potential to bridge and enhance immune responses in individuals with pre-existing immunity. This strategy holds promise for advancing universal influenza vaccine development.

Organizational Affiliation

Institute of Bioengineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
H1H3 HA	A [auth B]	227	Influenza A virus	Mutation(s): 0
UniProt
Find proteins for B2VLU9 (Influenza A virus) Explore B2VLU9 Go to UniProtKB: B2VLU9
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	B2VLU9
Glycosylation
Glycosylation Sites: 2	Glycosylation Focus chain A [auth B]
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
FluA20 Heavy Chain Fab	B [auth H]	235	Homo sapiens	Mutation(s): 0

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
FluA20 Light Chain Fab	C [auth L]	214	Homo sapiens	Mutation(s): 0

Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	D [auth A]	2		N-Glycosylation	Interactions Focus chain D [auth A] Interactions & Density Focus chain D [auth A]
Glycosylation Resources
GlyTouCan: G42666HT GlyCosmos: G42666HT GlyGen: G42666HT

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NAG Query on NAG Download:Ideal Coordinates CCD File SDF format, chain E [auth B] MOL2 format, chain E [auth B] mmCIF format, chain E [auth B]	E [auth B]	2-acetamido-2-deoxy-beta-D-glucopyranose C₈ H₁₅ N O₆ OVRNDRQMDRJTHS-FMDGEEDCSA-N		Interactions Focus chain E [auth B] Interactions & Density Focus chain E [auth B]
EDO Query on EDO Download:Ideal Coordinates CCD File SDF format, chain K [auth L] SDF format, chain J [auth L] SDF format, chain I [auth L] SDF format, chain H [auth L] SDF format, chain G [auth L] SDF format, chain F [auth H] MOL2 format, chain K [auth L] MOL2 format, chain J [auth L] MOL2 format, chain I [auth L] MOL2 format, chain H [auth L] MOL2 format, chain G [auth L] MOL2 format, chain F [auth H] mmCIF format, chain K [auth L] mmCIF format, chain J [auth L] mmCIF format, chain I [auth L] mmCIF format, chain H [auth L] mmCIF format, chain G [auth L] mmCIF format, chain F [auth H]	F [auth H] G [auth L] H [auth L] I [auth L] J [auth L] F [auth H], G [auth L], H [auth L], I [auth L], J [auth L], K [auth L]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain F [auth H] Focus chain G [auth L] Focus chain H [auth L] Focus chain I [auth L] Focus chain J [auth L] Focus chain K [auth L] Interactions & Density Focus chain F [auth H] Focus chain G [auth L] Focus chain H [auth L] Focus chain I [auth L] Focus chain J [auth L] Focus chain K [auth L]