Objective To construct the multi-epitope prokaryotic expression plasmid and appropriate engineering bacteria expressing the multi-epitope fusion protein of urea membrane channel protein (UreI), urease B subunit (UreB) and adhesin (HpaA) ofHelicobacter pylorithen study its microbiological characteristics. Methods The target sequence contains multi-epitope gene sequence of Helicobacter pylori were designed and synthesized, subsequently; it was subcloned into the expression vector pET28a (+), confirmed by restriction enzyme digestion and DNA sequencing. The fusion protein rIBA was expressed in E.coli Rosseta (DE3) and analyzed by Western blot. Results The plasmid of pET28a(+)/IBA was constructed successfully, confirmed by endonuclease digestion and sequence analyze. The expressed rIBA protein with relative molecular mass about 40×10 3 and can be detected by Western blot. Conclusion The prokaryotic engineering bacteria expression multi-epitope of the Helicobacter pylori was constructed successfully. The recombinant protein rIBA expressed by the engineering bacteria can be identified by Sydney strain 1 of Helicobacter pylori (H. pylori SS1) specific antibody IgY, which demonstrated that the rIBA has high correlation with H.pylori SS1.
