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|標題:||Dual expression of the HA protein of H5N2 avian influenza virus in a baculovirus system||作者:||Hu, Y.C.
|關鍵字:||Avian influenza;baculovirus;HA protein;green fluorescent protein;insect cells;a-viruses;affinity-chromatography;nucleocapsid protein;h7 subtypes;hemagglutinin;purification;antibodies;cleavage||Project:||Journal of Virological Methods||期刊/報告no：:||Journal of Virological Methods, Volume 135, Issue 1, Page(s) 43-48.||摘要:||
Baculovirus/insect cell system is used widely for recombinant protein production. The hemagglutinin (HA) gene of H5N2 avian influenza virus (AIV) 1209 strain and the enhanced green fluorescent protein (EGFP) gene were cloned into pFastBac DUAL vector that has two promoters and cloning sites, allowing simultaneous expression of these two genes. The HA protein of AIV was fused with a hexahistidine (His(6)) tag for purification. The coexpression of EGFP allowed identification of the recombinant baculoviruses in Sf-9 insect cells, eliminating cumbersome and time-consuming assays. A recombinant baculovirus, Bac-HA, was generated by transfecting pBac-HA to bacmid inside DH10B(AC) Escherichia coli by site-specific transposition, followed by transfection into the Sf-9 cells. Fluorescence in the insect cells was observed from 3 days post-infection. The expressed HA protein was confirmed by Western blot using an anti-HA monoclonal antibody. Also, different detergents and incubation times on ice were tested. The two-stage extraction with Triton X-100 or Tween 20 and incubation on ice for 2 h exhibited high efficiency. Since purification of HA with ConA resin resulted in low protein recovery, lentil lectin affinity column was used and was useful for HA purification. (c) 2006 Elsevier B.V. All rights reserved.
|Appears in Collections:||分子生物學研究所|
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