• BRIEF REPORTS • Cloning and expression and immunogenicity of Helicobacter pylori

AIM: To construct a recombinant strain which expresses BabA of Helicobacter pylori (H pylori) and to study the immunogenicity of BabA. METHODS: BabA2 DNA was amplified by PCR and inserted into the prokaryotie expression vector pET-22b (+) and expressed in the BL21 (DE3) E.coli strain. Furthermore, BabA immunogenicity was studied by animal test. RESULTS: DNA sequence analysis showed the sequence of BabA2 DNA was the same as the one published by GenBank. The BabA recombinant protein accounted for 34.8 % of the total bacterial protein. The serum from H pylori infected patients and Balb/c miced immunized with BabA itself could recognize rBabA. CONCLUSION: BabA recombinant protein may be an potentia