Characterization of neutralizing epitopes within the major capsid protein of human papillomavirus type 33.

Abstract:

BACKGROUND:Infections with papillomaviruses induce type-specific immune responses, mainly directed against the major capsid protein, L1. Based on the propensity of the L1 protein to self-assemble into virus-like particles (VLPs), type-specific vaccines have already been developed. In order to generate vaccines that target a broader spectrum of HPV types, extended knowledge of neutralizing epitopes is required. Despite the association of human papillomavirus type 33 (HPV33) with cervical carcinomas, fine mapping of neutralizing conformational epitopes on HPV33 has not been reported yet. By loop swapping between HPV33 and HPV16 capsid proteins, we have identified amino acid sequences critical for the binding of conformation-dependent type-specific neutralizing antibodies to surface-exposed hyper variable loops of HPV33 capsid protein L1. RESULTS:Reactivities of monoclonal antibodies (mAbs) H33.B6, H33.E12, H33.J3 and H16.56E with HPV16:33 and HPV33:16 hybrid L1 VLPs revealed the complex structures of their conformational epitopes as well as the major residues contributing to their binding sites. Whereas the epitope of mAb H33.J3 was determined by amino acids (aa) 51-58 in the BC loop of HPV33 L1, sequences of at least two hyper variable loops, DE (aa 132-140) and FGb (aa 282-291), were found to be essential for binding of H33.B6. The epitope of H33.E12 was even more complex, requiring sequences of the FGa loop (aa 260-270), in addition to loops DE and FGb. CONCLUSION:These data demonstrate that neutralizing epitopes in HPV33 L1 are mainly located on the tip of the capsomere and that several hyper variable loops contribute to form these conformational epitopes. Knowledge of the antigenic structure of HPV is crucial for designing hybrid particles as a basis for intertypic HPV vaccines.

journal_name

Virol J

journal_title

Virology journal

authors

Roth SD,Sapp M,Streeck RE,Selinka HC

doi

10.1186/1743-422X-3-83

subject

Has Abstract

pub_date

2006-10-02 00:00:00

pages

83

issn

1743-422X

pii

1743-422X-3-83

journal_volume

3

pub_type

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