Related Experiment Videos
Purification and characterization of two major outer membrane proteins from Porphyromonas gingivalis
S Kokeguchi1, K Kato, H Kurihara
1Okayama University Dental School, Japan.
Abstract:
Outer membrane proteins (OMPs) were extracted from whole cells of several Porphyromonas and Prevotella strains and their OMPs profiles were examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The SDS-PAGE analysis revealed that OMP profiles of Porphyromonas and Prevotella strains show species-specific patterns and P. gingivalis characteristically had two kinds of major outer membrane proteins (MOMPs). A 53 Kd MOMP from P. gingivalis FDC 381 and a 67 Kd MOMP from ATCC 33277 were purified. Sera from periodontitis patients and healthy subjects were analyzed for immunoreactivities against both the purified MOMPs of P. gingivalis by immunoblotting analysis. The sera from 18 patients reacted to the 53 Kd MOMP, 10 to the 67 Kd MOMP, and only three sera reacted to both MOMPs. The sera of healthy subjects also reacted, but weakly, to either the 53 Kd or 67 Kd MOMP. The SDS-PAGE OMP profiles prepared from 13 clinical isolates of P. gingivalis and immunoblotting analysis of human sera against the two kinds of P. gingivalis MOMPs indicate that periodontal diseases resulting from P. gingivalis are initiated and sustained by at least two MOMPs of P. gingivalis.
Insights
Outer membrane proteins (OMPs) from Porphyromonas gingivalis were analyzed. Two major OMPs (53 kDa and 67 kDa) were identified as key targets in periodontitis patients, indicating their role in disease initiation and progression.
Area of Science:
- Microbiology
- Immunology
- Periodontology
Background:
- Porphyromonas gingivalis is a key pathogen in periodontitis.
- Outer membrane proteins (OMPs) are crucial for bacterial-host interactions.
- Species-specific OMP profiles exist in Porphyromonas and Prevotella.
Purpose of the Study:
- To characterize OMP profiles of Porphyromonas and Prevotella strains.
- To identify specific P. gingivalis OMPs involved in periodontitis.
- To assess the immunogenicity of P. gingivalis OMPs in periodontitis patients.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for OMP profiling.
- Purification of major outer membrane proteins (MOMPs) from P. gingivalis.
- Immunoblotting analysis of patient and healthy subject sera against purified MOMPs.
Main Results:
- SDS-PAGE revealed species-specific OMP patterns.
- P. gingivalis exhibited two characteristic MOMPs (53 kDa and 67 kDa).
- Periodontitis patient sera showed significant reactivity to both 53 kDa and 67 kDa MOMPs, with lower reactivity in healthy subjects.
Conclusions:
- Periodontal disease caused by P. gingivalis is initiated and sustained by at least two major outer membrane proteins.
- These MOMPs are potential targets for diagnosing or treating periodontitis.