Cloning and Expression of the Nucleoprotein Gene (NP) of Newcastle Disease Virus (NDV) in Escherichia coli for Immunodiagnosis Application
DOI:
https://doi.org/10.3923/ijps.2014.473.479Keywords:
Cloning of NDV-NP gene, expression, ELISA, immunodiagnosis Application, newcastle disease virus, recombinant nucleocapsid protien, SUMOAbstract
The nucleocapsid protein (NP) of newcastle disease virus (NDV) is an important antigen to develop a serologic assay on account of its highly conserved sequences and high immunogenicity. This study aimed to express the gene of the NP of NDV in a heterologous system (Escherichia coli), using the appropriate vector. The NDV-NP protein was expressed as a fusion recombinant protein containing SUMO peptide and poly-histidine tags. This recombinant nucleocapsid protein (rNP) was expressed in a soluble form which was easily purified and showed the ability to react with chicken anti-NDV polyclonal antibodies. An indirect ELISA method based on the adsorption of an antigen composed by NP (rNP-NDV-ELISA) was developed. By comparing this rNP-NDV-ELISA with haemagglutination-inhibition test (HI) high and significant correlation with the HI (r = 0.83) was found. In addition, high sensitivity (88.9%), specificity (95.5%), accuracy (90.4%) and agreement (0.85) were obtained. In conclusion the results indicated that the cloning and expression procedures used in this study provided a rNP that shared the major epitopes with the homologous viral protein and has the potential to be applied in ELISA for the immunodiagnosis of the Newcastle Disease.
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