Prokaryotic Expression of RaDtxR Gene of Riemerella anatipestifer

Based on the previously obtained characterization on the RaDtxR gene of Riemerella anatipestifer, upstream and downstream primers were designed with BamHⅠ and Xho Ⅰ restriction enzyme sites added at the 5'-teriminal. These quence of the RaDtxR gene was amplified and cloned into the prokaryotic expression vector pGEX-4T-1 to generate recombinant plasmids pGEX-4T-1-RaDtxR. Then, the expression conditions were optimized by IPTG induced by SDS-PAGE, and the biological activity identified by Western blot. SDS-PAGE and Western blot confirmed that the protein with a molecular weight approximating 51 ku was well expressed with a significant biological activity. Therefore, the highly efficient expression ofthe RaDtxR protein would provide a basis for further study associated with the specificgene.