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Clinical and Diagnostic Laboratory Immunology, July 2000, p. 645-651, Vol. 7, No. 4
1071-412X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Antigenic Properties and Diagnostic Potential of Baculovirus-Expressed Infectious Bursal Disease Virus Proteins VPX and VP3

Jorge L. Martínez-Torrecuadrada,1 Beatriz Lázaro,1 José F. Rodriguez,2 and J. Ignacio Casal*

INGENASA, 28037 Madrid,1 and Centro Nacional de Biotecnologia (CSIC-UAM), 28049 Madrid,2 Spain

Received 31 January 2000/Returned for modification 4 April 2000/Accepted 5 May 2000

The routine technique for detecting antibodies specific to infectious bursal disease virus (IBDV) is a serological evaluation by enzyme-linked immunosorbent assay (ELISA) with preparations of whole virions as the antigens. To avoid using complete virus in the standard technique, we have developed two new antigens through the expression of the VPX and VP3 genes in insect cells. VPX and especially VP3 were expressed at high levels in insect cells and simple to purify. The immunogenicity of both proteins was similar to that of the native virus. VPX was able to elicit neutralizing antibodies but VP3 was not. Purified VPX and VP3 were tested in an indirect ELISA with more than 300 chicken sera. There was an excellent correlation between the results of the ELISA using VPX and those of the two commercial kits. VP3 did not perform as well as VPX, and the linear correlation was significantly lower. A comparison with the standard reference technique, seroneutralization, showed that the indirect ELISA was more sensitive. Therefore, VPX-based ELISA is a good alternative to conventional ELISAs that use whole virions.

* Corresponding author. Mailing address: INGENASA, Hnos Garcia Noblejas 41, 4, 28037 Madrid, Spain. Phone: 34 91 3680501. Fax: 34 91 4087598. E-mail: icasal{at}ingenasa.es.

Clinical and Diagnostic Laboratory Immunology, July 2000, p. 645-651, Vol. 7, No. 4
1071-412X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Caston, J. R., Martinez-Torrecuadrada, J. L., Maraver, A., Lombardo, E., Rodriguez, J. F., Casal, J. I., Carrascosa, J. L. (2001). C Terminus of Infectious Bursal Disease Virus Major Capsid Protein VP2 Is Involved in Definition of the T Number for Capsid Assembly. J. Virol. 75: 10815-10828 [Abstract] [Full Text]  


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