Abstract
Recombinant human papillomavirus (HPV) virus-like particle (VLP) vaccines based on the L1 capsid protein have been shown to be efficient prophylactic vaccines, albeit type-specific. As a first step to investigate the feasibility of extending protection against non-vaccine types, HPV-16 L1 chimaeras were generated. The region downstream of L1 amino acid (aa) 413 was replaced with selected cross-neutralising epitopes (aa 108-120; 56-81 and 17-36) derived from the HPV-16 L2 protein, generating proteins designated SAF, L2.56 and L2.17, respectively. The chimaera L1BPV containing BPV-1 L2 peptide aa 1-88 was similarly constructed. The chimaeras were evaluated for expression in insect cells; their ability to form particles was studied by electron microscopy, and their immunogenicity was evaluated in mice. SAF, L2.56 and L2.17 proteins were expressed to high concentrations in insect cells and elicited HPV-16 pseudovirus-neutralising anti-L1 antibodies. L2.56 and L2.17 also elicited anti-L2 antibodies. L1BPV was a poor vaccine candidate due to low levels of expression with concomitant lack of immunogenicity. All chimaeras assembled into tertiary structures. The results indicate that chimaeric L1 vaccines incorporating cross-neutralising L2 peptides could be promising second-generation prophylactic HPV vaccine candidates.





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Acknowledgments
We thank Rodney Lucas for the animal work, and Bruce Allan for technical assistance on pseudovirion neutralisation assays. We also thank Mark Whitehead, David Mutepfa and Cathy Pineo for their technical assistance. Thanks to Dr. Neil Christensen (Department of Pathology, Milton S. Hershey Medical Center, Hershey, Pennsylvania, PA, USA) for supplying monoclonal antibodies, and Dr. John Schiller (Laboratory of Cellular Oncology, National Cancer Institute, Bethesda, MD, USA) for the plasmids used in the HPV pseudovirion neutralisation assay. The South African Department of Science and Technology/National Research Foundation funded this project.
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McGrath, M., de Villiers, G.K., Shephard, E. et al. Development of human papillomavirus chimaeric L1/L2 candidate vaccines. Arch Virol 158, 2079–2088 (2013). https://doi.org/10.1007/s00705-013-1713-8
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DOI: https://doi.org/10.1007/s00705-013-1713-8