Related Experiment Videos
Identification and localization of a 94 kDa membrane protein found in Mycoplasma bovoculi strains
1Veterinary Medical Research Institute, College of Veterinary Medicine, Iowa State University, Ames 50011, USA.
Abstract:
Six isolates of Mycoplasma bovoculi obtained from cattle herds with bovine keratoconjunctivitis were analyzed by gel electrophoresis and immunoblotting techniques. All six strains showed similarity in their protein profiles although no two patterns were identical. Antigenic differences between strains were detected in immunoblots reacted with post-exposure calf serum. A common 94 kDa protein band designated p94 was detected in all six strains reacted with monoclonal antibody MA25.5 developed to one of the strains. The p94 was also recognized in these strains by the calf serum. Trypsin treatment of intact mycoplasma cells resulted in the removal of p94 from immunoblots reacted with MA or hyperimmune rabbit serum. Other trypsin-resistant antigens shared between strains or being strain-specific in nature were identified when trypsin-treated mycoplasma cells were reacted with hyperimmune rabbit serum. The p94 antigen was shown to be of mycoplasmal origin by radio-immunoprecipitation using the MA or hyperimmune rabbit serum. These studies identify the presence of a surface antigen (p94) on M. bovoculi membrane in all strains examined that is trypsin sensitive by the use of monoclonal antibody, calf serum and hyperimmune rabbit serum.
Insights
This study identified a common surface protein, p94, in all Mycoplasma bovoculi strains causing bovine keratoconjunctivitis. This protein is sensitive to trypsin, offering potential for diagnostic and therapeutic targets in cattle eye disease.
Area of Science:
- Veterinary Microbiology
- Bacterial Pathogenesis
- Immunology
Background:
- Mycoplasma bovoculi is a significant cause of infectious bovine keratoconjunctivitis (IBK).
- Understanding the antigenic composition of M. bovoculi is crucial for developing effective control strategies.
- Previous studies have indicated heterogeneity among M. bovoculi isolates.
Purpose of the Study:
- To characterize the protein profiles and antigenic properties of Mycoplasma bovoculi isolates from cattle with IBK.
- To identify common and strain-specific antigens within M. bovoculi.
- To investigate the surface localization and characteristics of a potential M. bovoculi antigen.
Main Methods:
- Gel electrophoresis and immunoblotting techniques were employed to analyze six M. bovoculi isolates.
- Monoclonal antibody (MA25.5), post-exposure calf serum, and hyperimmune rabbit serum were used for immunodetection.
- Trypsin treatment and radio-immunoprecipitation were utilized to assess antigen properties and origin.
Main Results:
- All six M. bovoculi strains exhibited similar yet distinct protein profiles.
- A common 94 kDa surface protein (p94) was identified across all strains using MA25.5 and calf serum.
- The p94 antigen was trypsin-sensitive, indicating its surface localization, and confirmed to be of mycoplasmal origin.
Conclusions:
- A conserved trypsin-sensitive surface antigen, p94, is present on Mycoplasma bovoculi strains associated with bovine keratoconjunctivitis.
- The p94 antigen represents a potential target for diagnostic assays and vaccine development against IBK.
- Further research into the role of p94 in M. bovoculi pathogenesis is warranted.