Development of a Western Blot Assay for Detection of Bovine Immunodeficiency-like Virus Using Capsid and Transmembrane Envelope Proteins Expressed from Recombinant Baculovirus

Overview

Journal Clin Diagn Lab Immunol

Publisher American Society for Microbiology

Specialty Allergy & Immunology

Date 1999 Mar 6

PMID 10066648

Citations 5

Authors

Y Abed

G St-Laurent

H Zhang

R M Jacobs

D Archambault

Affiliations

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Abstract

A 120-amino-acid polypeptide selected from the transmembrane protein region (tTM) and the major capsid protein p26 of bovine immunodeficiency-like virus (BIV) were expressed as fusion proteins from recombinant baculoviruses. The antigenic reactivity of both recombinant fusion proteins was confirmed by Western blot with bovine and rabbit antisera to BIV. BIV-negative bovine sera and animal sera positive for bovine syncytial virus and bovine leukemia virus failed to recognize the recombinant fusion proteins, thereby showing the specificity of the BIV Western blot. One hundred and five bovine serum samples were tested for the presence of anti-BIV antibodies by the recombinant protein-based Western blot and a reference Western blot assay using cell culture-derived virions as test antigens. There was a 100% concordance when the p26 fusion protein was used in the Western blot. However, the Western blot using the tTM fusion protein as its test antigen identified four BIV-positive bovine sera which had tested negative in both the p26 recombinant-protein-based and the reference Western blot assays. This resulted in the lower concordance of 96.2% between the tTM-protein-based and reference Western blot assays. The results of this study showed that the recombinant p26 and tTM proteins can be used as test antigens for the serodetection of BIV-infection in animals.

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