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Identification of immunogenic antigen candidate for Chlamydophila pneumoniae diagnosis
Sung-Ha Park1, Su-Jin Kwon, Sun-Jin Lee
1Laboratory of Pathogenic proteomics, Division of Bacterial Respiratory, Center for Infectious Diseases, National Institute of Health, Korea Centers for Disease Control and Prevention, Seoul, Korea.
Abstract:
Chlamydophila pneumoniae is a Gram-negative intracellular obligate human pathogen and accounts for 5-10% of cases of community-acquired pneumonia. However, isolating and culturing this pathogen is difficult, so there have been several studies searching for new biomarkers for its diagnosis. In this study, we obtained immunogenic proteins of C. pneumoniae KNIH-1 for diagnosis using immunoproteomics. C. pneumoniae infection sera were selected for the highest index value of C. pneumoniae-specific IgG using microimmunofluorescence (MIF). The detected protein spots in common from C. pneumoniae infection sera using proteome analysis were identified as Omp11, type III secretion system ATPase, and PmpG by LC-MS/MS and MS databases. They were selected as candidate antigens. In addition, using in silico prediction we also identified proteins encoded by Omp11, PmpG and IncA as antigens. And then, IncA acts as an effector by a type III secretion system ATPase, as identified by mass spectrometry, and was selected as a candidate antigen. Thus, we predict proteins encoded by Omp11, the PmpG family and by IncA as candidate diagnostic immunogens.
Insights
New diagnostic biomarkers for Chlamydophila pneumoniae were identified using immunoproteomics. Researchers found immunogenic proteins including Omp11, type III secretion system ATPase, and PmpG, offering potential for improved pneumonia diagnosis.
Area of Science:
- Microbiology
- Immunology
- Proteomics
Background:
- Chlamydophila pneumoniae causes 5-10% of community-acquired pneumonia.
- Difficulties in isolating and culturing C. pneumoniae necessitate novel diagnostic biomarkers.
Purpose of the Study:
- To identify immunogenic proteins of C. pneumoniae KNIH-1 for diagnostic purposes using immunoproteomics.
- To discover novel candidate antigens for C. pneumoniae diagnosis.
Main Methods:
- Immunoproteomic analysis of C. pneumoniae KNIH-1 using patient sera with high C. pneumoniae-specific IgG.
- Protein identification via Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) and in silico prediction.
- Selection of candidate antigens based on immunogenicity and functional roles.
Main Results:
- Identified Omp11, type III secretion system ATPase, and PmpG as common immunogenic proteins.
- In silico analysis predicted Omp11, PmpG family, and IncA as potential antigens.
- IncA was identified as an effector protein via mass spectrometry, selected as a candidate antigen.
Conclusions:
- Omp11, PmpG family proteins, and IncA are predicted as candidate diagnostic immunogens for C. pneumoniae.
- These identified proteins hold promise for developing new diagnostic tools for C. pneumoniae infections.
- Immunoproteomics is an effective strategy for discovering novel diagnostic antigens in bacterial pathogens.
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