Self-assembling protein nanoparticles and virus like particles correctly display β-barrel from meningococcal factor H-binding protein through genetic fusion

PLoS One. 2022 Sep 16;17(9):e0273322. doi: 10.1371/journal.pone.0273322. eCollection 2022.

Abstract

Recombinant protein-based vaccines are a valid and safer alternative to traditional vaccines based on live-attenuated or killed pathogens. However, the immune response of subunit vaccines is generally lower compared to that elicited by traditional vaccines and usually requires the use of adjuvants. The use of self-assembling protein nanoparticles, as a platform for vaccine antigen presentation, is emerging as a promising approach to enhance the production of protective and functional antibodies. In this work we demonstrated the successful repetitive antigen display of the C-terminal β-barrel domain of factor H binding protein, derived from serogroup B Meningococcus on the surface of different self-assembling nanoparticles using genetic fusion. Six nanoparticle scaffolds were tested, including virus-like particles with different sizes, geometries, and physicochemical properties. Combining computational and structure-based rational design we were able generate antigen-fused scaffolds that closely aligned with three-dimensional structure predictions. The chimeric nanoparticles were produced as recombinant proteins in Escherichia coli and evaluated for solubility, stability, self-assembly, and antigen accessibility using a variety of biophysical methods. Several scaffolds were identified as being suitable for genetic fusion with the β-barrel from fHbp, including ferritin, a de novo designed aldolase from Thermotoga maritima, encapsulin, CP3 phage coat protein, and the Hepatitis B core antigen. In conclusion, a systematic screening of self-assembling nanoparticles has been applied for the repetitive surface display of a vaccine antigen. This work demonstrates the capacity of rational structure-based design to develop new chimeric nanoparticles and describes a strategy that can be utilized to discover new nanoparticle-based approaches in the search for vaccines against bacterial pathogens.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aldehyde-Lyases
  • Antigens
  • Bacterial Vaccines
  • Carrier Proteins
  • Complement Factor H
  • Ferritins
  • Hepatitis B Core Antigens
  • Meningococcal Vaccines*
  • Nanoparticles* / chemistry
  • Neisseria meningitidis* / genetics
  • Recombinant Proteins
  • Vaccines, Combined
  • Vaccines, Subunit

Substances

  • Antigens
  • Bacterial Vaccines
  • Carrier Proteins
  • Hepatitis B Core Antigens
  • Meningococcal Vaccines
  • Recombinant Proteins
  • Vaccines, Combined
  • Vaccines, Subunit
  • Complement Factor H
  • Ferritins
  • Aldehyde-Lyases

Grants and funding

This work was sponsored by GlaxoSmithKline Biologicals SA which was involved in all stages of the study conduct and analysis supporting also the preparation and the publication of the manuscript.