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Identification of protein complexes with quantitative proteomics in S. cerevisiae
Published on: March 4, 2009
Identification of immunogenic proteins of Candida parapsilosis by serological proteome analysis
1Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.
Aims:
Systemic candidiasis is the leading fungal bloodstream infection, and its incidence has been on the rise. Recently, Candida parapsilosis has emerged as an increasingly prevalent fungal pathogen, but little is known about its antigenic profile. Hence, the current work was performed to discover immunogenic proteins of C. parapsilosis using serological proteome analysis.
Methods And Results:
Cell wall proteins extracted from C. parapsilosis were resolved by two-dimensional electrophoresis followed by immunoblotting using antisera from experimentally infected mice. Mass spectrometry analysis of the 32 immunoreactive protein spots resulted in the identification of 12 distinct proteins. Among them, 11 proteins were known antigens of Candida albicans, whereas Idh2p was identified for the first time as an immunogenic protein of Candida species. Recombinant Idh2p was expressed in Escherichia coli, and its antigenicity was verified by immunoblot analysis.
Conclusions:
An immunoproteomic approach was successfully applied to identify immunogenic proteins of C. parapsilosis, with Idh2p as a novel candidate antigen. The identified antigens may serve as potential biomarkers for development of diagnostic assay and/or vaccine for C. parapsilosis.
Significance And Impact Of The Study:
This work represents the first immunoproteomic analysis of C. parapsilosis, which provides new insights into host-pathogen interactions and pathogenesis of C. parapsilosis. The immunogenic proteins could be studied as biomarker candidates for C. parapsilosis.
Insights
Researchers identified novel immunogenic proteins in Candida parapsilosis, a growing cause of fungal infections. The study highlights Idh2p as a potential new target for diagnostics and vaccines against this pathogen.
Area of Science:
- Medical Mycology
- Immunoproteomics
- Fungal Pathogenesis
Background:
- Systemic candidiasis, a leading fungal bloodstream infection, is increasing.
- Candida parapsilosis is an emerging pathogen with an understudied antigenic profile.
Purpose of the Study:
- To identify immunogenic proteins of Candida parapsilosis using serological proteome analysis.
- To discover novel antigens for potential diagnostic and vaccine development.
Main Methods:
- Two-dimensional electrophoresis and immunoblotting of Candida parapsilosis cell wall proteins.
- Mass spectrometry to identify immunoreactive protein spots.
- Expression and antigenicity verification of recombinant Idh2p.
Main Results:
- Identified 12 distinct immunogenic proteins from Candida parapsilosis.
- Discovered Idh2p as a novel immunogenic protein in Candida species.
- Confirmed the antigenicity of recombinant Idh2p.
Conclusions:
- An immunoproteomic approach successfully identified immunogenic proteins of C. parapsilosis.
- Idh2p is a novel candidate antigen for C. parapsilosis.
- Identified antigens may serve as biomarkers for diagnostic assays and vaccines.
