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TitleDevelopment of a Two-Component Nanoparticle Vaccine Displaying an HIV-1 Envelope Glycoprotein that Elicits Tier 2 Neutralising Antibodies.
Journal, issue, pagesVaccines (Basel), Vol. 12, Issue 9, Year 2024
Publish dateSep 18, 2024
AuthorsKegomoditswe Malebo / Jeremy Woodward / Phindile Ximba / Qiniso Mkhize / Sanele Cingo / Thandeka Moyo-Gwete / Penny L Moore / Anna-Lise Williamson / Rosamund Chapman /
PubMed AbstractDespite treatment and other interventions, an effective prophylactic HIV vaccine is still an essential goal in the control of HIV. Inducing robust and long-lasting antibody responses is one of the ...Despite treatment and other interventions, an effective prophylactic HIV vaccine is still an essential goal in the control of HIV. Inducing robust and long-lasting antibody responses is one of the main targets of an HIV vaccine. The delivery of HIV envelope glycoproteins (Env) using nanoparticle (NP) platforms has been shown to elicit better immunogenicity than soluble HIV Env. In this paper, we describe the development of a nanoparticle-based vaccine decorated with HIV Env using the SpyCatcher/SpyTag system. The Env utilised in this study, CAP255, was derived from a transmitted founder virus isolated from a patient who developed broadly neutralising antibodies. Negative stain and cryo-electron microscopy analyses confirmed the assembly and stability of the mi3 into uniform icosahedral NPs surrounded by regularly spaced CAP255 gp140 Env trimers. A three-dimensional reconstruction of CAP255 gp140 SpyTag-SpyCatcher mi3 clearly showed Env trimers projecting from the centre of each of the pentagonal dodecahedral faces of the NP. To our knowledge, this is the first study to report the formation of SpyCatcher pentamers on the dodecahedral faces of mi3 NPs. To investigate the immunogenicity, rabbits were primed with two doses of DNA vaccines expressing the CAP255 gp150 and a mosaic subtype C Gag and boosted with three doses of the NP-developed autologous Tier 2 CAP255 neutralising antibodies (Nabs) and low levels of heterologous CAP256SU NAbs.
External linksVaccines (Basel) / PubMed:39340093 / PubMed Central
MethodsEM (single particle)
Resolution5.3 - 6.9 Å
Structure data

50615

9fo3

EMDB-50615, PDB-9fo3:
Structure of a gp140 SpyTag-SpyCatcher mi3 nanoparticle including mi3 density only.
Method: EM (single particle) / Resolution: 5.3 Å

EMDB-50635: Unmasked HIV-1 envelope trimer gp140 SpyTag SpyCatcher mi3 nanoparticle.
Method: EM (single particle) / Resolution: 6.9 Å

Source
  • thermotoga maritima (bacteria)
KeywordsIMMUNE SYSTEM / Vaccine / HIV-1 / mi3 / Nanoparticle / VLP

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