Journal List > J Bacteriol Virol > v.40(2) > 1033985

Park, Suh, Lee, Lee, Cheon, Oh, Oh, Park, and Paik: Antibody Production of Baculovirus-expressed VP6 from Porcine Group C Rotavirus

Abstract

The emerging pathogen, group C rotavirus (RVC) has been reported to cause acute diarrhea. But there was the limitation on the detection and monitoring for the absence of rapid sensitive diagnosis system. For the molecular biology study and diagnostic system development, we could detect porcine RVC by reverse transcriptase PCR (RT-PCR) analyses from 60 diarrheal disease porcine stool samples. VP6 full length RT-PCR product (CA-2 RVC, 1352 bp) was cloned and compared the nucleotide and deduced amino acid sequences with those of previously reported other porcine, human, and bovine rotavirus group A, B and C strains. Analyses data showed >82% homology on the nucleotide sequences and >90% homology on the deduced amino acid sequences with other RVCs. Recombinant baculovirus was prepared with cloned PCR product corresponding to VP6 coding sequence (CDS) (position 22~1206) into BaculoDirect™ C-term linear DNA, and used for the transfection of insect cells. The polyclonal antibody was produced from mice with purified recombinant VP6 and confirmed with western blot. Both of VP6 antigen and antibody, are useful for the development of rapid diagnostic system against RVC.

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Figure 1.
RT-PCR result for the detection of RVC with the 340 bp region of VP6 gene (A) and for the cloning of full length VP6 gene (B). (A) Lane 1, porcine RVC positive (340 bp); 2, negative control; M, 100 bp ladder. (B) Lane 1, full length VP6 (1352 bp); 2, negative control; M, 1 kb ladder.
jbv-40-83f1.tif
Figure 2.
Analysis of expression of recombinant VP6 protein from insect cells (A, B) and confirmation of activity of polyclonal antibody (C). (A) 12% SDS-PAGE analysis of recombinant VP6 protein (M, Protein size marker; Lane 1, 2 μg of cell lysate); (B) Western blot analysis of recombinant VP6 protein with anti-HisG antibody (1:5,000) (Lane 1, total cell lysate; 2, supernatant of cell lysate; 3, flowthrough; 4~5, washed; 6~8, eluted); (C) Western blot analysis using mouse polyclonal antibody (1:2,000) (Lane 1, 1.5 μg; 2, 3 μg of recombinant VP6 protein)
jbv-40-83f2.tif
Table 1.
Comparison of the nucleotide and deduced amino acid sequence homologies of the VP6 gene of CA-2 RVC with other rotavirus strains
Host species Group Strain Accession numbers Percent homology (%)
Nucleotide Amino acid Nucleotide Amino acid
Human A B1711 EF554086 ABU49770 51.6 40.4
Human A Hun5 EF554108 ABU49772 53.3 41.9
Bovine A WC3 AF411322 AAM73767 52.8 41.9
Avian A CH2 EF687020 ABV46497 50.2 42.2
Porcine A RU172 DQ204741 ABB17170 49.0 40.9
Human B WH-1 AY539858 AAT09116 37.6 15.7
Human B BANG373 AY238389 AAQ18653 37.6 15.9
Bovine B DB176 GQ358713 ADC53099 39.7 16.9
Human C Belem M94155 AAA47339 82.6 90.7
Human C Bristol X59843 CAA42504 82.8 90.7
Bovine C Shintoku M88768 AAA03235 82.4 90.4
Porcine C Cowden M94157 AAA47097 86.2 93.7
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