Isolation, cloning and expression of the Brucella melitensis Omp31 gene

Brucellosis is a zoonotic disease transmitted to humans either from animals or from their products.Although brucellosis can be found worldwide, the Mediterranean Basin, South and Central America, EasternEurope, Asia, Africa, the Caribbean, and the Middle East have currently been listed as high-risk regions. Thegenus Brucella is classified in at least nine species. Brucella melitensis is the global pathogenic species ofBrucella. The outer membrane protein 31, (Omp31) from B. melitensis is considered as a protectiveimmunogen and an important candidate vaccine. Contamination of purified Omp31 protein by biochemicalmethods has made some restrictions in practical experiments. In this study, the Omp31coding gene of B.melitensis Rev 1 strain was inserted in pET32b(+) plasmid with extra His-tag sequence. The integrity of theconstructed plasmid was confirmed using restriction enzyme mapping and sequencing. Omp31 wasexpressed after induction with IPTG in Escherichia coli BL21. Recombinant Omp31 (rOmp31) was purifiedby chromatography through Ni-agarose. The electrophoresis showed successful purification andimmunoblotting confirmed immunereactivity of rOmp31. Obtained rOmp31 could be used as a researchexperimental tool in protection assays to find its potential as a vaccine candidate.