Expression of Adenylate Kinase of Schistosoma japonicum and Evaluation on the Immunoreactivity of the Recombinant Protein / 中国寄生虫学与寄生虫病杂志

ABSTRACT

Objective To express and purify the Schistosoma japonicum adenylate kinase(AK) protein of which the cDNA sequence was subcloned into the pET32a(+) soluble expression plasmid, and to evaluate its immunoreactivity. MethodsThe recombinant plasmid was transformed into {E.coli} BL21, and induced with IPTG for expression. The bacterial lysis was conducted by ultrasonication and the supernatant was analyzed by SDS_PAGE after boiling and centrifugation. The target protein was purified with the Ni_NTA agarose. The proteins on the gel were transferred to the PVDF film and then the immunoreactivity was tested by Western blotting using anti_6_His antibody, sera from rabbits 6 weeks after infected with cercariae or UV_attenuated cercariae. The purified protein was coated for ELISA to test the cercariae infected rabbit serum and the normal rabbit serum. Results The molecular weight of the target fusion protein was {Mr 40 000} after being induced with IPTG. The fused protein showed a single band when reacted with anti_6_His antibody, the cercariae infected rabbit serum and attenuated cercariae infected rabbit serum. Conclusion The AK protein is expressed as a fused protein with thioredoxin and its molecular weight is about {Mr 40 000}. This protein has a positive immunoreactivity with sera of rabbits infected with cercariae and UV_attenuated cercariae.