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Characterization of the highly immunogenic VP2 protrusion domain as a diagnostic antigen for members of Birnaviridae family.

Applied microbiology and biotechnology (2020-02-24)
Maryam Zafar, Majid Ali Shah, Aamir Shehzad, Anam Tariq, Mudasser Habib, Muhammad Muddassar, Muhammad Salahuddin Shah, Mazhar Iqbal, Farhid Hemmatzadeh, Moazur Rahman
ABSTRACT

Birnaviridae is a family of viruses (birnaviruses) which consists of four genera, members of which cause diseases in fish, birds, mollusks, and insects. The genome of birnaviruses encodes the highly immunogenic VP2 capsid protein. In order to demonstrate that the VP2 protein can be exploited as a diagnostic antigen for birnaviruses, we developed a lateral flow assay based on the surface-exposed VP2 protrusion domain of a representative birnavirus, infectious bursal disease virus (IBDV) of serotype 1 which causes the highly devastating infectious bursal disease in chickens. The biophysical characterization of the purified domain reveals that the domain predominantly consists of β-sheets, exists in a trimeric form, and remains folded at high temperatures, making it suitable for diagnostic purposes. Owing to its highly immunogenic nature and excellent biophysical properties, we employed the VP2 protrusion domain in a gold nanoparticle-based lateral flow assay for rapid detection of anti-IBDV antibodies in serum samples of infected chickens. Our results indicate that the domain binds anti-IBDV antibodies with high specificity during laboratory testing and on-site testing. The lateral flow assay reported here yields comparable results in a qualitative manner as obtained through a commercial enzyme-linked immunosorbent assay (ELISA). As VP2 is a common capsid protein of birnaviruses, the lateral flow assay can be generalized for other birnaviruses, and members of Tetraviridae and Nodaviridae families which contain homologous VP2 capsid proteins.

MATERIALS
Product Number
Brand
Product Description

Millipore
G041 Glass Fiber Conjugate Pad Strips, Lateral Flow, Assay Development, lateral flow immunoassays, lateral flow assay device, Immunoassay IVDs
Millipore
C083 Cellulose Fiber Sample Pad Strips, Lateral Flow, Assay Development, lateral flow immunoassays, lateral flow assay device, Immunoassay IVDs
Millipore
C083 Cellulose Fiber Sample Pad Strips, Lateral Flow, Assay Development, lateral flow immunoassays, lateral flow assay device, Immunoassay IVDs