1887

Abstract

The potential therapeutic effects of -specific immunoglobulin (IgY-) derived from egg yolk and identification of the immunodominant proteins have previously been reported. In this study, the urease epitope that is recognized by IgY- was identified and used as an immunogen to produce urease-specific IgY (IgY-HpU). Epitope regions were mapped and peptides of selected epitope regions were synthesized. The IgY- titre against synthetic peptides was evaluated using ELISA analysis. Hens were immunized with synthetic peptides conjugated with BSA. Urease activity was quantified by measuring the optical density of an indicator dye. Of the five synthetic peptides assayed, a peptide representing 15 amino acid residues of UreB (UB-3; aa 396–410, DNDNFRIKRYLSKYT) was specifically recognized by the IgY-. Immunization of hens with BSA-conjugated UB-3 resulted in the generation of IgY-HpU. IgY-HpU markedly reduced urease activity by 80 % as compared to control IgY (IgY-BSA). The availability of the synthetic UreB-derived peptide enabled the production of highly specific anti-urease IgY, which had a significant inhibitory effect on urease activity. Therefore, specific IgY-HpU produced using the synthetic peptide may be an effective tool against infection by .

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2004-01-01
2019-12-10
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