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Updated: Aug 8, 2026

A High Throughput MHC II Binding Assay for Quantitative Analysis of Peptide Epitopes
Published on: March 25, 2014
A predictive multiscale framework for post-translational modification-dependent peptide-MHC class I binding
Xiaoning Yao1,2, Yue Gang1,2, Yaoyue Zhang1,2
1School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, 116029, China.
Post-translational modifications (PTMs) finely tune antigen peptide-MHC-I binding. These modifications act as chemical switches, altering immune responses based on their location and type, as revealed by molecular dynamics simulations.
Area of Science:
- Structural Biology
- Computational Immunology
- Molecular Biophysics
Background:
- Antigen peptide binding to MHC class I (MHC-I) molecules is crucial for adaptive immunity.
- Post-translational modifications (PTMs) significantly influence this binding and T-cell recognition.
- Atomic-level understanding of PTM-mediated regulation of peptide-MHC-I (pMHC) interactions is limited.
Purpose of the Study:
- To elucidate the atomic-level mechanisms by which PTMs regulate pMHC binding.
- To investigate the context-dependent effects of various PTMs (acetylation, phosphorylation, citrullination, etc.) on pMHC systems.
- To develop a unified model for PTM-driven regulation of antigen presentation.
Main Methods:
- All-atom molecular dynamics (MD) simulations.
- Multidimensional energetic and dynamic analyses.
- Examination of diverse pMHC systems including viral, model, autoimmune, and tumor-associated antigens.
Main Results:
- PTM effects are highly context-dependent, influenced by modification site and chemical nature.
- Charge-altering PTMs (e.g., N-terminal acetylation, phosphorylation) weaken binding by disrupting electrostatics and expanding the MHC groove.
- Citrullination enhances binding affinity via hydrophobic interactions and groove contraction, offering mechanistic insight into autoimmune diseases.
Conclusions:
- PTMs act as atomic-level chemical switches regulating pMHC recognition through multiscale coupling mechanisms.
- A unified structure-energy-dynamics model explains PTM-dependent regulation of antigen presentation.
- The computational framework shows predictive potential for PTM-specific pMHC binding behaviors.
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