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Intact Transition Epitope Mapping-Force Differences between Original and Unusual Residues (ITEM-FOUR)
Claudia Röwer1, Christian Ortmann2, Andrei Neamtu3
1Proteome Center Rostock, University Medicine Rostock and University of Rostock, Schillingallee 69, 18059 Rostock, Germany.
Biomolecules
|January 21, 2023
Summary
Analyzing antibody binding with the ITEM-FOUR method reveals how single amino acid changes affect diagnostic accuracy. This is crucial for improving antibody-based tests for conditions like myocardial infarction.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Immunology
Background:
- Antibody-based diagnostics are vital for personalized medicine.
- Accurate antibody recognition is key to reliable diagnostic tests.
- Current methods lack amino acid resolution for fine-mapping antibody-antigen interactions.
Purpose of the Study:
- To develop a method for fine-mapping antibody-antigen binding strengths at amino acid resolution.
- To investigate the impact of single amino acid polymorphisms on antibody binding.
- To address limitations in current antibody-based point-of-care diagnostics.
Main Methods:
- Utilized the ITEM-FOUR (Intact Mass-selected, Temperature-controlled, Equilibrium dissociation, Four-dimensional) approach.
- Employed modern mass spectrometry to analyze intact immune complexes in the gas phase.
- Integrated ITEM-FOUR with molecular dynamics simulations for detailed analysis.
Main Results:
- Experimentally determined dissociation enthalpies for wild-type and mutated epitope peptides.
- Ranked peptides based on binding strength, identifying specific amino acid polymorphisms affecting antibody binding.
- Demonstrated that single amino acid changes can weaken, impair, or abolish antibody binding.
Conclusions:
- The ITEM-FOUR approach provides amino acid-level insights into antibody-epitope interactions.
- This method can identify critical single amino acid polymorphisms impacting diagnostic test performance.
- Findings are relevant for improving antibody-based diagnostics, particularly for conditions like myocardial infarction.
