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Antigenic Profile of African Horse Sickness Virus Serotype 4 VP5 and Identification of a Neutralizing Epitope Shared with Bluetongue Virus and Epizootic Hemorrhagic Disease Virus

Identifieur interne : 003965 ( Main/Exploration ); précédent : 003964; suivant : 003966

Antigenic Profile of African Horse Sickness Virus Serotype 4 VP5 and Identification of a Neutralizing Epitope Shared with Bluetongue Virus and Epizootic Hemorrhagic Disease Virus

Auteurs : Jorge L. Mart Amp X0301 Nez-Torrecuadrada [Espagne] ; Jan P. M. Langeveld [Pays-Bas] ; Angel Venteo [Espagne] ; Antonio Sanz [Espagne] ; Kristian Dalsgaard [Danemark] ; William D. O. Hamilton [Royaume-Uni] ; Rob H. Meloen [Pays-Bas] ; J. Ignacio Casal [Espagne]

Source :

RBID : ISTEX:E7CC67E81A948963BECCAA03651F0BD335E0AE6C

English descriptors

Abstract

Abstract: African horse sickness virus (AHSV) causes a fatal disease in horses. The virus capsid is composed of a double protein layer, the outermost of which is formed by two proteins: VP2 and VP5. VP2 is known to determine the serotype of the virus and to contain the neutralizing epitopes. The biological function of VP5, the other component of the capsid, is unknown. In this report, AHSV VP5, expressed in insect cells alone or together with VP2, was able to induce AHSV-specific neutralizing antibodies. Moreover, two VP5-specific monoclonal antibodies (MAbs) that were able to neutralize the virus in a plaque reduction assay were generated. To dissect the antigenic structure of AHSV VP5, the protein was cloned inEscherichia coliusing the pET3 system. The immunoreactivity of both MAbs, and horse and rabbit polyclonal antisera, with 17 overlapping fragments from VP5 was analyzed. The most immunodominant region was found in the N-terminal 330 residues of VP5, defining two antigenic regions, I (residues 151–200) and II (residues 83–120). The epitopes were further defined by PEPSCAN analysis with 12mer peptides, which determined eight antigenic sites in the N-terminal half of the molecule. Neutralizing epitopes were defined at positions 85–92 (PDPLSPGE) for MAb 10AE12 and at 179–185 (EEDLRTR) for MAb 10AC6. Epitope 10AE12 is highly conserved between the different orbiviruses. MAb 10AE12 was able to recognize bluetongue virus VP5 and epizootic hemorrhagic disease virus VP5 by several techniques. These data will be especially useful for vaccine development and diagnostic purposes.

Url:
DOI: 10.1006/viro.1999.9680


Affiliations:


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Le document en format XML

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<term>Absorbance</term>
<term>Absorbance values</term>
<term>African horse sickness</term>
<term>African horse sickness virus</term>
<term>African horse sickness virus serotype</term>
<term>African horsesickness virus</term>
<term>African horsesickness virus serotype</term>
<term>Ahsv</term>
<term>Ahsv serotypes</term>
<term>Ahsv virions</term>
<term>Amino</term>
<term>Amino acid sequences</term>
<term>Amino acids</term>
<term>Amino terminus</term>
<term>Antibody binding</term>
<term>Antigenic</term>
<term>Antigenic determinants</term>
<term>Antigenic regions</term>
<term>Antigenic site</term>
<term>Antigenic sites</term>
<term>Antigenic structure</term>
<term>Antiserum</term>
<term>Ascitic fluid</term>
<term>Assay</term>
<term>Axis genetics</term>
<term>Bamhi</term>
<term>Bamhi fragment</term>
<term>Binding specificity</term>
<term>Biological function</term>
<term>Bluetongue</term>
<term>Bluetongue virus</term>
<term>Bluetongue virus serotype</term>
<term>Bluetongue viruses</term>
<term>Capsid</term>
<term>Capsid protein</term>
<term>Casal</term>
<term>Coli</term>
<term>Coli strains</term>
<term>Coliderived fragments</term>
<term>Competent cells</term>
<term>Competitive binding elisa</term>
<term>Different orbiviruses</term>
<term>Elisa</term>
<term>Epitope</term>
<term>Epitope mapping</term>
<term>Epizootic hemorrhagic disease</term>
<term>Equal volume</term>
<term>Escherichia coli</term>
<term>Evolutionary relationships</term>
<term>Expression vectors</term>
<term>First report</term>
<term>Fragment</term>
<term>Fusion proteins</term>
<term>Greater affinity</term>
<term>Highest serum dilution</term>
<term>Horse antisera</term>
<term>Horse rabbit</term>
<term>Horse sera</term>
<term>Horsesickness</term>
<term>Immune response</term>
<term>Immunoblotting</term>
<term>Immunoblotting analyses</term>
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<term>Insect cells</term>
<term>Lesser extent</term>
<term>Linear antigenic sites</term>
<term>Loading buffer</term>
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<term>Molecular weight markers</term>
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<term>Monolayer protection assay</term>
<term>Mouse mabs</term>
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<term>Neutralization</term>
<term>Neutralizing</term>
<term>Neutralizing activity</term>
<term>Neutralizing antibodies</term>
<term>Neutralizing epitopes</term>
<term>Orbivirus</term>
<term>Orbivirus vp5s</term>
<term>Orbiviruses</term>
<term>Outer capsid proteins</term>
<term>Outer shell</term>
<term>Palyam serogroup viruses</term>
<term>Pepscan</term>
<term>Pepscan analyses</term>
<term>Pepscan analysis</term>
<term>Peptide</term>
<term>Phage display</term>
<term>Plaque reduction assay</term>
<term>Plasmid</term>
<term>Polyclonal</term>
<term>Polyclonal antisera</term>
<term>Polyclonal sera</term>
<term>Positive controls</term>
<term>Positive reaction</term>
<term>Preimmune rabbit serum</term>
<term>Primer</term>
<term>Rabbit</term>
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<term>Rabbit antiserum</term>
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<term>Recombinant plasmids</term>
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<term>Vero cells</term>
<term>Vero monolayer protection assay</term>
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<term>Virol</term>
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<div type="abstract" xml:lang="en">Abstract: African horse sickness virus (AHSV) causes a fatal disease in horses. The virus capsid is composed of a double protein layer, the outermost of which is formed by two proteins: VP2 and VP5. VP2 is known to determine the serotype of the virus and to contain the neutralizing epitopes. The biological function of VP5, the other component of the capsid, is unknown. In this report, AHSV VP5, expressed in insect cells alone or together with VP2, was able to induce AHSV-specific neutralizing antibodies. Moreover, two VP5-specific monoclonal antibodies (MAbs) that were able to neutralize the virus in a plaque reduction assay were generated. To dissect the antigenic structure of AHSV VP5, the protein was cloned inEscherichia coliusing the pET3 system. The immunoreactivity of both MAbs, and horse and rabbit polyclonal antisera, with 17 overlapping fragments from VP5 was analyzed. The most immunodominant region was found in the N-terminal 330 residues of VP5, defining two antigenic regions, I (residues 151–200) and II (residues 83–120). The epitopes were further defined by PEPSCAN analysis with 12mer peptides, which determined eight antigenic sites in the N-terminal half of the molecule. Neutralizing epitopes were defined at positions 85–92 (PDPLSPGE) for MAb 10AE12 and at 179–185 (EEDLRTR) for MAb 10AC6. Epitope 10AE12 is highly conserved between the different orbiviruses. MAb 10AE12 was able to recognize bluetongue virus VP5 and epizootic hemorrhagic disease virus VP5 by several techniques. These data will be especially useful for vaccine development and diagnostic purposes.</div>
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