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Bacillus piliformis flagellar antigens for serodiagnosis of Tyzzer's disease
1Department of Veterinary Pathology, University of Missouri, Columbia 65211.
Abstract:
Purified flagella from multiple isolates of Bacillus piliformis were obtained and examined by electron microscopy. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blot (immunoblot) analyses were used to assess the purity, antigenicity, and cross-reactivity of purified flagellar preparations. SDS-PAGE demonstrated a single, major protein band evident at approximately 53 to 56 kDa in all isolates tested. Results of Western blot analyses indicated a lack of cross-reactivity between flagellar antigens and heterologous isolates. Enzyme-linked immunosorbent assays (ELISAs) were used to compare the efficacies of flagellar preparations from the various isolates as antigens in detecting B. piliformis serum antibodies from several host species. ELISA results indicated that no single flagellar preparation could be relied on to consistently identify serum antibodies in all the host species tested; however, ELISAs that utilized a trivalent flagellar antigen preparation were shown to be specific and sensitive for the detection of antibodies to B. piliformis.
Insights
Purified flagella from Bacillus piliformis isolates were analyzed. A trivalent flagellar antigen preparation demonstrated specific and sensitive detection of B. piliformis antibodies across multiple host species.
Area of Science:
- Veterinary Microbiology
- Immunology
- Protein Biochemistry
Background:
- Bacillus piliformis causes significant disease in various animal species.
- Accurate serological diagnostic tools are crucial for B. piliformis detection.
- Flagella are key virulence factors and potential diagnostic antigens.
Purpose of the Study:
- To characterize purified flagella from B. piliformis isolates.
- To evaluate the diagnostic potential of flagellar antigens for antibody detection.
- To develop a sensitive and specific assay for B. piliformis.
Main Methods:
- Purification of flagella from multiple B. piliformis isolates.
- Electron microscopy for structural examination.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for purity assessment.
- Western blot (immunoblot) for antigenicity and cross-reactivity analysis.
- Enzyme-linked immunosorbent assays (ELISAs) for antibody detection efficacy.
Main Results:
- SDS-PAGE confirmed a major protein band (53-56 kDa) in purified flagella.
- Western blots showed no cross-reactivity between flagellar antigens and heterologous isolates.
- No single flagellar preparation consistently detected antibodies across all host species.
- A trivalent flagellar antigen preparation demonstrated high specificity and sensitivity in ELISAs.
Conclusions:
- Purified B. piliformis flagella are suitable antigens for diagnostic assay development.
- A single flagellar preparation is insufficient for broad-spectrum antibody detection.
- A trivalent flagellar antigen ELISA offers a reliable method for diagnosing B. piliformis infections.