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Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
Published on: March 24, 2017
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High-density Peptide Arrays Help to Identify Linear Immunogenic B-cell Epitopes in Individuals Naturally Exposed to
Thomas Jaenisch1, Kirsten Heiss2, Nico Fischer3
1From the ‡Center for Infectious Diseases, Parasitology Unit, Heidelberg University Hospital, Im Neuenheimer Feld 324, D 69120 Heidelberg, Germany;; §German Center for Infectious Disease Research, Heidelberg (DZIF);; ¶HEiKA - Heidelberg Karlsruhe Research Partnership, Heidelberg University, Karlsruhe Institute of Technology (KIT), Germany;.
Molecular & Cellular Proteomics : MCP
|January 12, 2019
Summary
High-density peptide arrays effectively profile malaria antibody responses by identifying specific epitopes on Plasmodium falciparum proteins. This approach verifies known structures and discovers novel immunogenic epitopes, aiding vaccine development.
Area of Science:
- Immunology
- Parasitology
- Vaccine Development
Background:
- High-density peptide arrays offer a detailed method for analyzing antibody responses against Plasmodium (malaria) parasites.
- Analyzing antibody reactivity to specific epitopes provides deeper insights than using full-length proteins, potentially explaining variations in malaria immunity and susceptibility.
Purpose of the Study:
- To identify specific immunogenic epitopes within key Plasmodium falciparum proteins using high-density peptide arrays.
- To compare different epitope discovery strategies, including mapping vaccine candidates, bioinformatics prediction, and random screening.
Main Methods:
- Developed and utilized high-density peptide arrays with overlapping 15-mer peptides from twelve leading malaria vaccine candidates and other Plasmodium proteins.
- Employed particle-based laser printing to create array replicas for screening serum samples from individuals in a malaria-endemic region.
- Classified individuals' immunological status as protected or unprotected based on clinical data and parasite density.
Main Results:
- Significant antibody reactivities were detected across all twelve vaccine candidate proteins.
- Confirmed known immunogenic B-cell epitopes and mapped new epitopes across entire antigen sequences.
- Bioinformatics prediction successfully identified known and novel immunogenic epitopes, including those from hypothetical proteins.
Conclusions:
- High-density peptide arrays are powerful tools for mapping B-cell epitopes in Plasmodium falciparum.
- This technology aids in verifying existing knowledge and discovering novel epitopes for malaria vaccine design.
- Combining array screening with bioinformatics enhances the identification of immunogenic regions within the malaria parasite proteome.
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