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. 1989 Jan;63(1):375–382. doi: 10.1128/jvi.63.1.375-382.1989

Antigenic and functional organization of human parainfluenza virus type 3 fusion glycoprotein.

K van Wyke Coelingh 1, E L Tierney 1
PMCID: PMC247693  PMID: 2462062

Abstract

Twenty-six monoclonal antibodies (MAbs) (14 neutralizing and 12 nonneutralizing) were used to examine the antigenic structure, biological properties, and natural variation of the fusion (F) glycoprotein of human type 3 parainfluenza virus (PIV3). Analysis of laboratory-selected antigenic variants and of PIV3 clinical isolates indicated that the panel of MAbs recognizes at least 20 epitopes, 14 of which participate in neutralization. Competitive binding assays indicated that the 14 neutralization epitopes are organized into three nonoverlapping antigenic sites (A, B, and C) and one bridge site (AB) and that the 6 nonneutralization epitopes form four sites (D, E, F, and G). Most of the neutralizing MAbs were involved in nonreciprocal competitive binding reactions, suggesting that they induce conformational changes in other neutralization epitopes. Fusion-inhibition and complemented-enhanced neutralization assays indicated that antigenic sites AB, B, and C may correspond to functional domains of the F molecule. Our results indicated that antibody binding alone is not sufficient for virus neutralization and that many anti-F MAbs neutralize by mechanisms not involving fusion-inhibition. The degree of antigenic variation in the F epitopes of clinical strains was examined by binding and neutralization tests. It appears that PIV3 frequently develops mutations that produce F epitopes which efficiently bind antibodies, but are completely resistant to neutralization by these antibodies.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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