Journal of Microbiology and Biotechnology
The Korean Society for Microbiology and Biotechnology publishes the Journal of Microbiology and Biotechnology.
Journal of Microbiology and Biotechnology
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2014 ; 24(12): 1719~1727

AuthorMohamed Rasheed Gadalla, Ayman Hany El-Deeb, Mohamed Maged Emara, Hussein Aly Hussein
AffiliationDepartment of Virology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
TitleInsect Cell Surface Expression of Hemagglutinin (HA) of Egyptian H5N1 Avian Influenza Virus Under Transcriptional Control of Whispovirus Immediate Early-1 Promoter
PublicationInfo J. Microbiol. Biotechnol.2014 ; 24(12): 1719~1727
AbstractIn the present study, whispovirus immediate early 1 promoter (ie-1) was used to initiate surface expression of the hemagglutinin (HA) protein of Egyptian H5N1 avian influenza virus (AIV) by using the baculovirus expression vector system. The HA gene and whispovirus ie-1 promoter sequence were synthesized as a fused expression cassette (ie1-HA) and successfully cloned into the pFastBac-1 transfer vector. The recombinant vector was transformed into DH10Bac competent cells, and the recombinant bacmid was generated via site-specific transposition. The recombinant bacmid was used for transfection of Spodoptera frugiperda (Sf-9) insect cells to construct the recombinant baculovirus and to induce expression of the HA protein of H5N1 AIV. The recombinant glycoprotein expressed in Sf-9 cells showed hemadsorption activity. Hemagglutination activity was also detected in both extra- and intracellular recombinant HAs. Both the HA and hemadsorption activities were inhibited by reference polyclonal anti-H5 sera. Significant expression of the recombinant protein was observed on the surface of infected insect cells by using immunofluorescence. SDS-PAGE analysis of the expressed protein revealed the presence of a visually distinguishable band of ~63 kDa in size, which was absent in the non-infected cell control. Western blot analysis confirmed that the distinct 63 kDa band corresponded to the recombinant HA glycoprotein of H5N1 AIV. This study reports the successful expression of the HA protein of H5N1 AIV. The expressed protein was displayed on the plasma membrane of infected insect cells under the control of whispovirus ie-1 promoter by using the baculovirus expression vector system.
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KeywordsAvian influenza, Hemagglutinin, Baculovirus, Whispovirus immediate early-1, Promoter
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