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Published on: June 18, 2016
Identification of a 29 kDa flagellar sheath protein in Helicobacter pylori using a murine monoclonal antibody
Abstract:
The membrane-like flagellar sheath of Helicobacter pylori is of unknown function and little is known of its composition. A murine monoclonal antibody to H. pylori, designated GF6, which reacts by immunoblot with a polypeptide with an apparent molecular mass of 29 kDa was shown by immunogold-electron microscopy to label specifically the flagellar sheath structure. The antigen was detected by immunoblot using the monoclonal antibody in all 11 strains, of diverse geographic origin, so far tested. The antibody also reacted weakly with polypeptides with apparent molecular masses of 65 kDa in Vibrio cholerae and Vibrio parahaemolyticus. The antigen was shown by one- and two-dimensional electrophoretic analysis and immunoblotting to be distinct from the abundant urease subunit UreA, of similar molecular mass. Identification of this flagellar sheath polypeptide will facilitate investigation of the structure and function of the flagellar sheath of this important gastric pathogen.
Insights
Researchers identified a novel 29 kDa flagellar sheath protein in Helicobacter pylori using a monoclonal antibody. This discovery aids in understanding the structure and function of this important gastric pathogen's flagella.
Area of Science:
- Microbiology
- Immunology
- Pathogen Research
Background:
- The flagellar sheath of Helicobacter pylori, a significant gastric pathogen, has an unknown function and poorly understood composition.
- Understanding H. pylori flagellar components is crucial for developing targeted interventions against this bacterium.
Purpose of the Study:
- To identify and characterize novel components of the Helicobacter pylori flagellar sheath.
- To investigate the potential role of a specific 29 kDa polypeptide in the flagellar sheath structure.
Main Methods:
- Utilized a murine monoclonal antibody (GF6) for immunodetection of H. pylori flagellar sheath components.
- Employed immunoblotting and immunogold-electron microscopy to identify and localize the target antigen.
- Performed one- and two-dimensional electrophoresis to analyze protein composition and differentiate from known proteins like urease.
Main Results:
- A monoclonal antibody (GF6) specifically labeled a 29 kDa polypeptide within the H. pylori flagellar sheath.
- This 29 kDa antigen was detected across diverse geographic strains of H. pylori.
- The identified antigen is distinct from the abundant urease subunit (UreA) and showed weak cross-reactivity with Vibrio species.
Conclusions:
- A novel 29 kDa polypeptide has been identified as a component of the Helicobacter pylori flagellar sheath.
- This finding provides a crucial target for future research into the structure and function of H. pylori flagella.
- Further investigation of this protein may reveal new insights into H. pylori motility and pathogenicity.
