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Bluetongue virus (BTV) is a member of the genus Orbivirus, within the family Reoviridae. The VP7 protein of BTV is used for developing group-specific serological assays. To prepare monoclonal antibody (MAb) against VP7 of the 25th serotype BTV, the RNA S7 encoding VP7 was cloned into prokaryotic expression vectors pET-28a (+) and pGEX-6P-1 to generate recombinant plasmids. The recombinant protein VP7 was expressed in Escherichia coli BL21 (DE3), respectively. The results of SDS-PAGE revealed that the VP7 was expressed and the molecular mass of recombinant fusion protein pET-28a (+)/VP7 and pGEX-6P-1/VP7 was approximately 44 kDa and 64 kDa, respectively. The Western blot analysis indicated that the recombinant VP7 possessed good immunoreactivity. After purification, pET-28a (+)/VP7 was used to immunize BALB/c mice, while pGEX-6P-1/VP7 was used to screen for well-to-well MAb-secreting hybridomas. The hybridoma cell line 3H7 against recombinant VP7 that secreted MAbs was obtained. The isotype of 3H7 was identified as IgG1. The purification of recombinant VP7 protein and the monoclonal antibody will have potential applications on competitive ELISA format for BT-specific serum detection method.

Preparation and Characterization of a Monoclonal Antibody Against the Core Protein VP7 of the 25thSerotype of Bluetongue Virus

Preparation and Characterization of a Monoclonal Antibody Against the Core Protein VP7 of the 25^thSerotype of Bluetongue Virus