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The virulence factors such as shiga-like toxin (Stx) and immunogenic P39   protein in Escherichia coli and Brucella melitensis are related to disease of   digestive system in human worldwide. In the present study the stx2 and p39   genes were cloned into expression plasmid pEEF1D-FLAG (pcDNA 3.1+) as a   divalent DNA vaccine candidate. The Enterohemorrhagic E. coli ATCC 3081 and   smooth virulent B. melitensis strain M5 were obtained and cultured on   specific media. Bacterial DNA was extracted from colonies and was used for   p39 and stx2 genes amplification by PCR. The amplified products on 2% agarose   gel electrophoresis were revealed 285 and 1220 bp fragments for stx2 and p39   genes, respectively. Each amplified genes were T/A cloned into pGEM-T easy   vector and pGEM-T-stx2 and pGEM-T-p39 were produced. The stx2 and p39 genes   were sub-cloned in linearized expression vector (pcDNA 3.1+) using HindIII,   XhoI and XbaI restriction enzymes and pCDNA3-stx2-p39 was generated. This   final construct was confirmed by PCR and enzymes digestion. The results were   showed stx2 and p39 genes were sub-cloned, successfully into pcDNA 3.1+ to   generate pcDNA 3.1+-stx2-p39 recombinant vector. According to these findings   novel recombinant pcDNA 3.1+-stx2- p39 construct that was produced in this   study could be useful as DNA vaccine candidate in animal models against   shiga-like toxin producing E. coli and virulence B. melitensis strains in   future studies

Generation of divalent DNA vaccine based on p39 and shiga-like toxin 2 (Stx2) genes