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Sequence- and Structure-Based Immunoreactive Epitope Discovery for Burkholderia pseudomallei Flagellin
Arnone Nithichanon1, Darawan Rinchai1, Alessandro Gori2
1The Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand.
Plos Neglected Tropical Diseases
|July 30, 2015
Summary
Researchers identified key flagellin peptides from Burkholderia pseudomallei as potential components for a new melioidosis vaccine. These epitopes show immunoreactivity and enhance bacterial killing, offering hope against this serious infection.
Area of Science:
- Microbiology and Immunology
- Vaccine Development
- Structural Biology
Background:
- Burkholderia pseudomallei causes melioidosis, a severe disease with limited treatment options.
- The bacterium's resistance to antibiotics and intracellular nature highlight the need for effective vaccines.
- Flagellin of Burkholderia pseudomallei (FliCBp) is a promising subunit vaccine candidate.
Purpose of the Study:
- To determine the high-resolution crystal structure of FliCBp.
- To synthesize and characterize peptides predicted to be B and T cell epitopes of FliCBp.
- To evaluate the immunogenicity and potential of these epitopes as vaccine components.
Main Methods:
- High-resolution crystal structure determination of FliCBp.
- In silico epitope prediction using structure-based and sequence-based methods.
- Peptide synthesis and characterization.
- In vitro assessment of immunoreactivity against human antibodies and cytokine production from human peripheral blood mononuclear cells.
- Evaluation of antibody-mediated enhancement of neutrophil bactericidal activity.
Main Results:
- The high-resolution crystal structure of FliCBp was determined.
- Three peptides were synthesized and validated as B and T cell epitopes.
- All synthesized epitopes demonstrated immunoreactivity with human IgG and induced cytokine production.
- Two dominant epitopes (F51-69 and F270-288) were identified.
- Antibodies against these dominant epitopes enhanced the bactericidal activity of human neutrophils.
Conclusions:
- The identified FliCBp epitopes are immunoreactive and immunogenic in humans.
- These epitopes hold potential as key components for a novel melioidosis vaccine.
- Further development of these epitopes could lead to improved prevention and treatment strategies for melioidosis.
