Abstract
We have previously identified 11 epitopes located in two topologically nonoverlapping antigenic sites (A and B) and a third bridging site (C) on the human type 3 parainfluenza virus (PIV3) hemagglutinin-neuraminidase (HN) glycoprotein by using monoclonal antibodies (MAbs) which inhibit hemagglutination and virus infectivity (K. L. Coelingh, C. C. Winter, and B. R. Murphy, Virology 143:569-582, 1985). We have identified three additional antigenic sites (D, E, and F) on the HN molecule by competitive-binding assays of anti-HN MAbs which have no known biological activity. Epitopes in sites A, D, and F are conserved on the bovine PIV3 HN glycoprotein and also among a wide range of human isolates. The dideoxy method was used to identify nucleotide substitutions in the HN genes of antigenic variants selected with neutralizing MAbs representing epitopes in site A which are shared by human and bovine PIV3. The deduced amino acid substitutions in the variants were located in separate hydrophilic stretches of HN residues which are conserved in the primary structures of the HN proteins of both human and bovine PIV3 strains.
MeSH Terms
Animals
Antibodies, Monoclonal/immunology
Antibodies, Viral/immunology
Antigens, Viral/genetics,immunology
Base Sequence
Cattle/microbiology
Cross Reactions
Epitopes/genetics,immunology
HN Protein
Humans
Respirovirus/genetics,immunology
Species Specificity
Viral Envelope Proteins/genetics,immunology
Chemicals
Antibodies, Monoclonal
Antibodies, Viral
Antigens, Viral
Epitopes
HN Protein
Viral Envelope Proteins
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Coelingh K J
Winter C C
Murphy B R
Rice J M
Kimball P C
Olmsted R A
Collins P L
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