8ur5

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I53_dn5 nanoparticle displaying the trimeric HA heads with heptad domain, TH-1heptad-I53_dn5 (local refinement of TH-1heptad)

Structural highlights

8ur5 is a 3 chain structure with sequence from Influenza A virus and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3.7Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

HEMA_I00A1 Binds to sialic acid-containing receptors on the cell surface, bringing about the attachment of the virus particle to the cell. This attachment induces virion internalization either through clathrin-dependent endocytosis or through clathrin- and caveolin-independent pathway. Plays a major role in the determination of host range restriction and virulence. Class I viral fusion protein. Responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane. Low pH in endosomes induces an irreversible conformational change in HA2, releasing the fusion hydrophobic peptide. Several trimers are required to form a competent fusion pore.[HAMAP-Rule:MF_04072]

Publication Abstract from PubMed

Immunogen design approaches aim to control the specificity and quality of antibody responses elicited by next-generation vaccines. Here, we use computational protein design to generate a nanoparticle vaccine platform based on the receptor-binding domain (RBD) of influenza hemagglutinin (HA) that enables precise control of antigen conformation and spacing. HA RBDs are presented as either monomers or native-like closed trimers that are connected to the underlying nanoparticle by a rigid linker that is modularly extended to precisely control antigen spacing. Nanoparticle immunogens with decreased spacing between trimeric RBDs elicit antibodies with improved hemagglutination inhibition and neutralization potency as well as binding breadth across diverse H1 HAs. Our "trihead" nanoparticle immunogen platform provides insights into anti-HA immunity, establishes antigen spacing as an important parameter in structure-based vaccine design, and embodies several design features that could be used in next-generation vaccines against influenza and other viruses.

Antigen spacing on protein nanoparticles influences antibody responses to vaccination.,Ellis D, Dosey A, Boyoglu-Barnum S, Park YJ, Gillespie R, Syeda H, Hutchinson GB, Tsybovsky Y, Murphy M, Pettie D, Matheson N, Chan S, Ueda G, Fallas JA, Carter L, Graham BS, Veesler D, Kanekiyo M, King NP Cell Rep. 2023 Dec 13;42(12):113552. doi: 10.1016/j.celrep.2023.113552. PMID:38096058^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Ellis D, Dosey A, Boyoglu-Barnum S, Park YJ, Gillespie R, Syeda H, Hutchinson GB, Tsybovsky Y, Murphy M, Pettie D, Matheson N, Chan S, Ueda G, Fallas JA, Carter L, Graham BS, Veesler D, Kanekiyo M, King NP. Antigen spacing on protein nanoparticles influences antibody responses to vaccination. Cell Rep. 2023 Dec 13;42(12):113552. PMID:38096058 doi:10.1016/j.celrep.2023.113552