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Journal of Virology, June 1999, p. 4882-4889, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Characterization of a Major Neutralizing Epitope on Human Papillomavirus Type 16 L1

Wendy I. White,1,* Susan D. Wilson,1 Frances J. Palmer-Hill,1 Robert M. Woods,1 Shin-je Ghim,2 Lisa A. Hewitt,1 Daniel M. Goldman,1 Steven J. Burke,1 A. Bennett Jenson,2 Scott Koenig,1 and JoAnn A. Suzich1

MedImmune, Inc., Gaithersburg, Maryland 20878,1 and Department of Pathology, Georgetown University Medical Center, Washington, D.C. 200072

Received 19 November 1998/Accepted 18 March 1999

Persistent infection with human papillomavirus type 16 (HPV-16) is strongly associated with the development of cervical cancer. Neutralizing epitopes present on the major coat protein, L1, have not been well characterized, although three neutralizing monoclonal antibodies (MAbs) had been identified by using HPV-16 pseudovirions (R. B. Roden et al., J. Virol. 71:6247-6252, 1997). Here, two of these MAbs (H16.V5 and H16.E70) were demonstrated to neutralize authentic HPV-16 in vitro, while the third (H16.U4) did not. Binding studies were conducted with the three MAbs and virus-like particles (VLPs) composed of the reference L1 sequence (114K) and three variant L1 sequences: Rochester-1k (derived from viral stock DNA), GU-1 (derived from cervical biopsy DNA), and GU-2 (derived from biopsy DNA, but containing some sequence changes likely to be artifactual). While all three MAbs bound to 114K and Rochester-1k VLPs, GU-1 VLPs were not recognized by H16.E70, and both H16.E70 and H16.V5 failed to bind to GU-2 VLPs. Site-directed mutagenesis was used to replace disparate amino acids in the GU-2 L1 with those found in the 114K L1. Alteration of the amino acid at position 50, from L to F, completely restored H16.V5 binding and partially restored H16.E70 binding, while complete restoration of H16.E70 binding occurred with GU-2 VLPs containing both L50F and T266A alterations. Immunization of mice with L1 variant VLPs revealed that GU-2 VLPs were poorly immunogenic. The L50F mutant of GU-2 L1, in which the H16.V5 epitope was restored, elicited HPV-16 antibody responses comparable to those obtained with 114K VLPs. These results demonstrate the importance of the H16.V5 epitope in the generation of potent HPV-16 neutralizing antibody responses.

* Corresponding author. Mailing address: 35 West Watkins Mill Rd., Gaithersburg, MD 20878. Phone: (301) 417-0770. Fax: (301) 527-4200. E-mail: whitew{at}medimmune.com.

Journal of Virology, June 1999, p. 4882-4889, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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