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Updated: Feb 26, 2026
Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
Published on: March 24, 2017
Designing Probes for Immunodiagnostics: Structural Insights into an Epitope Targeting Burkholderia Infections
Riccardo Capelli1,2, Elena Matterazzo3, Marco Amabili1,3
1Istituto di Chimica del Riconoscimento Molecolare, Consiglio Nazionale delle Ricerche , Via Mario Bianco 9, 20131 Milano, Italy.
Abstract:
Structure-based epitope prediction drives the design of diagnostic peptidic probes to reveal specific antibodies elicited in response to infections. We previously identified a highly immunoreactive epitope from the peptidoglycan-associated lipoprotein (Pal) antigen from Burkholderia pseudomallei, which could also diagnose Burkholderia cepacia infections. Here, considering the high phylogenetic conservation within Burkholderia species, we ask whether cross-reactivity can be reciprocally displayed by the synthetic epitope from B. cenocepacia. We perform comparative analyses of the conformational preferences and diagnostic performances of the corresponding epitopes from the two Burkholderia species when presented in the context of the full-length proteins or as isolated peptides. The effects of conformation on the diagnostic potential and cross-reactivity of Pal peptide epitopes are rationalized on the basis of the 1.8 Å crystal structure of B. cenocepacia Pal and through computational analyses. Our results are discussed in the context of designing new diagnostic molecules for the early detection of infectious diseases.
Insights
Synthetic peptide epitopes from Burkholderia species show cross-reactive diagnostic potential. This research explores designing new diagnostic tools for early infectious disease detection.
Area of Science:
- Microbiology and Immunology
- Structural Biology
- Infectious Disease Diagnostics
Background:
- Epitope prediction is crucial for developing diagnostic probes for infections.
- A previously identified Burkholderia pseudomallei peptidoglycan-associated lipoprotein (Pal) epitope diagnosed B. cepacia infections.
Purpose of the Study:
- To investigate reciprocal cross-reactivity of synthetic Pal epitopes between Burkholderia species.
- To analyze conformational preferences and diagnostic performance of these epitopes.
Main Methods:
- Comparative analysis of epitope conformational preferences and diagnostic performance.
- Utilizing a 1.8 Å crystal structure of B. cenocepacia Pal.
- Employing computational analyses to rationalize conformational effects.
Main Results:
- Synthetic epitopes from Burkholderia species exhibit cross-reactive diagnostic capabilities.
- Conformation significantly influences the diagnostic potential and cross-reactivity of Pal peptide epitopes.
- Structural insights rationalize observed cross-reactivity patterns.
Conclusions:
- Reciprocal cross-reactivity exists between Pal epitopes of different Burkholderia species.
- Understanding conformational effects is key for designing broadly applicable diagnostic molecules.
- This study contributes to the development of novel diagnostics for early infectious disease detection.
