Immunogenicity Evaluation of Chimeric Subunit Vaccine Comprising Adhesion Coli Surface Antigens from Enterotoxigenic Escherichia coli.
Enterotoxigenic Escherichia coli (ETEC) is the most common agent of diarrhea morbidity in developing countries. ETEC adheres to host intestinal epithelial cells via various colonization factors. The CooD and CotD proteins play a significant role in bacteria binding to the intestinal epithelial cells as adhesin tip subunits of CS1 and CS2 pili. The purpose here was to design a new construction containing cooD and cotD genes and use several types of bioinformatics software to predict the structural and immunological properties of the designed antigen. The fusion gene was synthesized with codon bias of E. coli in order to increase the expression level of the protein. The amino acid sequences, protein structure, and immunogenicity properties of potential antigens were analyzed in silico. The chimeric protein was expressed in E. coliBL21 (DE3). The antigenicity of the recombinant proteins was verified by Western blotting and ELISA. In order to assess the induced immunity, the immunized mice were challenged with wild-type ETEC by an intraperitoneal route. Immunological analyses showed the production of a high titer of IgG serum with no sign of serum-mucosal IgA antibody response. The result of the challenge assay showed that 30% of immunized mice survived. The results of this study showed that CooD-CotD recombinant protein can stimulate immunity against ETEC. The designed chimera could be a prototype for the subunit vaccine, which is worthy of further consideration.
['Khoobbakht|Dorna|D|', 'Zare Karizi|Shohreh|S|', 'Motamedi|Mohammad Javad|MJ|', 'Kazemi|Rouhollah|R|', 'Roghanian|Pooneh|P|', 'Amani|Jafar|J|']
D018829:Adhesins, Bacterial D000818:Animals D000954:Antigens, Surface D054307:Enterotoxigenic Escherichia coli D029968:Escherichia coli Proteins D022361:Escherichia coli Vaccines D000071497:Immunogenicity, Vaccine D007070:Immunoglobulin A D007074:Immunoglobulin G D051379:Mice D008807:Mice, Inbred BALB C D009690:Nucleic Acid Conformation D011993:Recombinant Fusion Proteins D022223:Vaccines, Subunit
Subunit vaccine Enterotoxigenic Escherichia coli cooD cotD ELISA