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High-Resolution Structure Analysis of Antibody V5 and U4 Conformational Epitopes on Human Papillomavirus 16

Guan, Jian and Bywaters, Stephanie and Brendle, Sarah and Ashley, Robert and Makhov, Alexander and Conway, James and Christensen, Neil and Hafenstein, Susan (2017) High-Resolution Structure Analysis of Antibody V5 and U4 Conformational Epitopes on Human Papillomavirus 16. Viruses, 9 (12). ISSN 1999-4915

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Cancers attributable to human papillomavirus (HPV) place a huge burden on the health of both men and women. The current commercial vaccines are genotype specific and provide little therapeutic benefit to patients with existing HPV infections. Identifying the conformational epitopes on the virus capsid supports the development of improved recombinant vaccines to maximize long-term protection against multiple types of HPV. Fragments of antibody (Fab) digested from the neutralizing monoclonal antibodies H16.V5 (V5) and H16.U4 (U4) were bound to HPV16 capsids and the structures of the two virus-Fab complexes were solved to near atomic resolution using cryo-electron microscopy. The structures reveal virus conformational changes, the Fab-binding mode to the capsid, the residues comprising the epitope and indicate a potential interaction of U4 with the minor structural protein, L2. Competition enzyme-linked immunosorbent assay (ELISA) showed V5 outcompetes U4 when added sequentially, demonstrating a steric interference even though the footprints do not overlap. Combined with our previously reported immunological and structural results, we propose that the virus may initiate host entry through an interaction between the icosahedral five-fold vertex of the capsid and receptors on the host cell. The highly detailed epitopes identified for the two antibodies provide a framework for continuing biochemical, genetic and biophysical studies.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Guan, Jian
Bywaters, Stephanie
Brendle, Sarah
Ashley, Robert
Makhov, Alexanderamm241@pitt.eduamm241
Conway, Jamesjxc100@pitt.edujxc100
Christensen, Neil
Hafenstein, Susan
Date: 6 December 2017
Date Type: Publication
Journal or Publication Title: Viruses
Volume: 9
Number: 12
Publisher: MDPI AG
DOI or Unique Handle: 10.3390/v9120374
Schools and Programs: School of Medicine > Structural Biology
Refereed: Yes
Uncontrolled Keywords: human papillomavirus; cryo-electron Microscopy (cryo-EM); conformational epitope; antibody neutralization; U4 and V5; competition; steric clash; complex; virus; fab
ISSN: 1999-4915
Official URL:
Funders: Jake Gittlen Memorial Golf Tournament, Pennsylvania Department of Health CURE, Office of The Director, National Institutes of Health, National Cancer Institute
Article Type: Research Article
Date Deposited: 13 Jan 2021 18:57
Last Modified: 13 Jan 2021 18:57


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