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Outer membrane protein antigens of Moraxella bovis
Abstract:
Outer membranes were isolated from bovine isolates and type strains of Moraxella bovis, M phenylpyruvica, M lacunata, and M ovis by sodium N lauroyl sarcosinate extraction and differential centrifugation. Analysis of outer membranes from these organisms by sodium dodecyl sulfate-polyacrylamide-gel electrophoresis revealed that all M bovis isolates shared a common polypeptide pattern that was readily distinguishable from other Moraxella spp. Nine major outer membrane protein bands were identified by sodium dodecyl sulfate-polyacrylamide-gel electrophoresis analysis of M bovis. Immunoblotting of protein antigens of M bovis revealed several outer membrane proteins that seemed to be common antigens of all M bovis isolates.
Insights
Outer membranes of Moraxella bovis share a distinct protein pattern, differentiating them from other Moraxella species. This finding aids in identifying common antigens for M. bovis.
Area of Science:
- Veterinary Microbiology
- Bacterial Pathogenesis
- Proteomics
Background:
- Moraxella bovis is a significant pathogen in cattle, causing infectious bovine keratoconjunctivitis (IBK).
- Understanding the outer membrane proteins (OMPs) of M. bovis is crucial for vaccine development and diagnostics.
- Previous studies have characterized OMPs of various bacterial species, but a detailed comparison within Moraxella spp. is needed.
Purpose of the Study:
- To characterize and compare the outer membrane protein profiles of Moraxella bovis isolates and related Moraxella species.
- To identify common outer membrane antigens specific to M. bovis.
Main Methods:
- Outer membranes were isolated from bovine isolates and type strains of Moraxella bovis, M. phenylpyruvica, M. lacunata, and M. ovis.
- Sodium N-lauroyl sarcosinate extraction and differential centrifugation were used for membrane isolation.
- Sodium dodecyl sulfate-polyacrylamide-gel electrophoresis (SDS-PAGE) and immunoblotting were employed for protein analysis.
Main Results:
- SDS-PAGE analysis revealed a common polypeptide pattern for all M. bovis isolates, distinct from other Moraxella species.
- Nine major outer membrane protein bands were identified in M. bovis.
- Immunoblotting indicated the presence of several common outer membrane protein antigens across all M. bovis isolates.
Conclusions:
- The outer membrane protein profile of M. bovis is unique and can be used to distinguish it from other Moraxella species.
- Identification of common M. bovis outer membrane antigens provides targets for diagnostic and potentially therapeutic strategies.