幽門螺桿菌UreB抗原表位預(yù)測(cè)及其有效表位噬菌體展示的篩選
[Abstract]:Background and objective Helicobacter pylori (Hp) is a micro aerobic gram-negative bacilli, which is spiral. In most countries and regions, the rate of Hp infection is more than 50%. Many infected people are asymptomatic, but some infected people can appear acute and chronic gastritis and peptic ulcers. The persistent infection of Hp is also associated with gastric adenocarcinoma and gastric lymph nodes. .Hp has been listed as a class I carcinogenic factor by WHO. In recent years, the epidemiological data also found that Helicobacter pylori infection is associated with coronary heart disease, arteriosclerosis, thrombocytopenic purpura, diabetes, iron deficiency anemia, chronic idiopathic urticaria, bronchitis, and so on.
Urease is an important virulence factor of Hp, which can decompose urea into ammonia and carbon dioxide to neutralize the acid environment of the stomach and facilitate the colonization of Hp. The urease is about 10% of the total bacterial protein. The urease B subunit (UreB) is the large subunit of the urease, and the subunit of the urease catalyzed site.UreB is in the genus Helicobacter. It is conservative and has strong antigenicity, which attracts many scholars to study the vaccine based on UreB. The use of recombinant urease B subunit to produce vaccines to some extent can cause immune response, but can not achieve agreement on the effect of eliminating Hp. The immunization induced by a vaccine containing only one antigen protein is effective. It is often weak, and the practical application is not high.
The research strategy of multiple antigenic epitopes (epitope) with multiple antigen epitopes (multipleantigenic peptide, MAP), which has been developed in recent years, is very likely to be an effective way to solve subunit problems. Finding effective antigen epitopes is the first step in the development of MAP. The study of antigen epitopes can deeply reveal the immune response induced by protein antigen molecules. The molecular mechanism and its characteristics have an important application prospect in the development of new molecular vaccines and new serological detection methods. This study intends to screen B and Th cell antigen epitopes of Helicobacter pylori urease B subunit (UreB), laying a foundation for the development of polyantigenic peptide (MAP) vaccine.
The recombinant expression product rUreB was purified by Ni-NTA affinity chromatography. The rabbit antiserum was prepared by routine intradermal immunization. Bioinformatics was used to predict and analyze the epitopes of B and Th cells of UreB. The combined epitopes of the UreB main B cells and Th cells were selected and the fusion table was reached on the M13KE phage P III protein, PEG / NaCl. The recombinant phage was purified by precipitation method, and the recombinant P III protein (rP III) was identified by SDS-PAGE. RUreB antiserum and commercialized anti Hp whole bacteria IgG were used as one antibody, respectively, and the above epitope peptides were identified and screened by Western blot.
Results the expression of rUreB was about 30% of the total bacterial protein. After purification, only a single protein band was found. After immunizing the rabbit, the antiserum was obtained. Compared with the related sequences in GenBank, the nucleotide and amino acid similarity of the ureB gene in our laboratory was 96% to 99.5% and 96% to 100%., respectively, and 4 had Th cells and B. The cell epitope peptide segments UreB230, UreB322, UreB479 and UreB527 were successfully expressed in the M13 phage. The use of different Western blot showed similar positive results, but the reaction intensity of UreB322 and UreB527 was significantly higher than that of UreB230 and UreB479..
Conclusion the recombinant UreB protein was successfully obtained and rabbit antiserum was obtained. The phage display system of the joint epitope of Th cells and B cells was constructed. The bioinformatics techniques used can effectively predict the epitopes of the antigen. The effective antigen epitopes of UreB322 and UreB527 are identified in the laboratory and can be used as the MAP vaccine of Helicobacter pylori. Select the table.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2007
【分類號(hào)】:R378
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