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Construction, Cloning, and Expression of Caga Recombinant Protein of Helicobacter Pylori



Moghaddam AS1 ; Mansouri S2 ; Neshani A2 ; Firoozeh F3 ; Matinpur A4, 5 ; Khaledi A4, 5 ; Ghazalibina M6
Authors
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Authors Affiliations
  1. 1. Department of Immunology, BuAli Research Institute, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
  2. 2. Antimicrobial Resistance Research Center, Department of Microbiology, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
  3. 3. Department of Microbiology, Faculty of Medicine, Alborz University of Medical Sciences, Karaj, Iran
  4. 4. Infectious Diseases Research Center, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
  5. 5. Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
  6. 6. Department of Microbiology, Faculty of Public Health, Tehran University of Medical Sciences, Tehran, Iran

Source: Avicenna Journal of Medical Biotechnology Published:2020

Abstract

Background: This study aimed to assess construction and expression of CagA recombinant protein of Helicobacter pylori (H. pylori) in Escherichia coli (E. coli) BL21. Methods: Bioinformatics was used in designing the desired gene by Gene Runner. Next, the construct was subcloned to pET21b vector and this process was confirmed by Polymerase Chain Reaction (PCR), enzyme digestion and sequencing techniques. Then, it was cloned in the Escherichia coli BL21 as an expression host. Expression of protein was verified using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting technique. For purification of the protein, the Ni-NTA column was used. Protein concentration was determined by the Bicinchoninic Acid Protein Assay Kit (Parstoos). Finally, Western blotting was performed using CagA antibodies and normal human serum for determining immunogenicity feature with human antiserum. Results: According to the results of the present study, CagA construct was cloned into the pET21b vector and after confirmation and cloning in host expression, recombinant protein with the size of 38 kDa was successfully expressed and purified. The recombinant CagA protein showed immunogenicity characteristics with human antiserum. Conclusion: In conclusion, only 5′-end of recombinant protein CagA with high immunogenicity effects was successfully constructed, cloned and expressed. Also, CagA recombinant protein showed good immunogenicity activity with human antiserum. © 2020, Avicenna Journal of Medical Biotechnology.
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