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| Expression and Identification of the VP60 Protein of Moschus chrysogaster hemorrhagic disease virus in the Insect Cell-Baculovirus System |
| LIU Yu-Dong1, SHAO Yu1, YANG Yong-Ning2, WANG Qing1, HUANG Dong1, HE Xiao-Xiao1, WANG Li1, MA Hai-Yun1, ZHAO Yun-Hai1, ZHANG Zhi-Xiong1, XING Xiao-Yong1, BAO Shi-Jun1,* |
1 College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China;
2 Qinghai Agri-animal Husbandry Vocational College, Xining 812100, China |
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Abstract Moschus chrysogaster viral hemorrhagic disease (McVHD) is an acute and highly lethal infectious disease caused by Moschus chrysogaster hemorrhagic disease virus (McHDV) in alpine musk deer. Currently, there are no preventive or therapeutic measures available for this disease. In order to develop a safe and effective vaccine against McVHD, in this study, the full-length gene of McHDV VP60 was amplified by PCR. The VP60 gene was then inserted into the vector pFastBac1, followed by transformation into DH10Bac competent cells containing the Bacmid plasmid. A recombinant bacmid, rBacmid-McHDV-VP60, carrying the VP60 gene, was constructed. Subsequently, Sf9 insect cells were transfected with the recombinant bacmid to obtain the recombinant baculovirus rBac-McHDV-VP60. The expression of the target protein in the recombinant baculovirus rBac-McHDV-VP60 was identified by Western blot and SDS-PAGE analyses. The VP60 protein was identified by transmission electron microscopy and erythrocyte agglutination assay. The results indicated that the bacmid rBacmid-McHDV-VP60 was successfully constructed and the recombinant baculovirus rBac-McHDV-VP60 was obtained. SDS-PAGE and Western blot confirmed that Sf9 cells infected with the recombinant baculovirus produced a soluble McHDV-VP60 protein, approximately 63 kD in size. Transmission electron microscopy showed that the McHDV-VP60 protein self-assembled into virus-like particles (VLPs), which were approximately 35 nm in size, spherical in shape, and smooth on the surface. Erythrocyte agglutination assay showed that the recombinant McHDV-VP60 protein solution had a hemagglutination titer of 1∶215 against 1% human (Homo?sapiens) O erythrocytes. In this study, a recombinant baculovirus expressing McHDV-VP60 protein was successfully constructed using an insect cell-baculovirus expression system, and the McHDV-VP60 protein could self-assemble into VLPs. This study provides technical support for the development of a vaccine for McVHD virus-like particles.
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Received: 04 June 2024
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Corresponding Authors:
*bsjdy@126.com
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