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Hotspot Interactions between Two Fab Molecules in Molecular Dynamics Simulations Improve Predictive Models of

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|February 9, 2026
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Summary

Identifying key interaction sites in protein-protein interactions (PPIs) is crucial. This study reveals that persistent contact sites, not just surface interactions, are vital for predicting protein aggregation and guiding protein engineering for enhanced stability.

Keywords:
antibody aggregationhotspot regionsmodel buildingmolecular dynamics simulationsmultiple antibody fragmentsprotein−protein interaction (PPI)

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Area of Science:

  • Biochemistry and Molecular Biology
  • Computational Biology
  • Protein Engineering

Background:

  • Protein-protein interactions (PPIs) are central to biological functions.
  • Identifying interaction hotspots is key for understanding protein aggregation and engineering proteins.
  • Limited research has explored the roles of surface vs. buried interactions (e.g., aggregation-prone regions or APRs).

Purpose of the Study:

  • To investigate and characterize key interaction sites between two Fab antibody fragments using molecular dynamics (MD) simulations.
  • To differentiate persistent interaction hotspots from transient contacts.
  • To assess the impact of identified hotspots and APRs on predicting protein aggregation kinetics.

Main Methods:

  • All-atom molecular dynamics (MD) simulations of two Fab antibody fragments.
  • Frequency contact map analysis to identify stable residue contacts.
  • Principal component analysis (PCA) to analyze conformational dynamics.
  • Inclusion of solvent accessibility data for surface hotspots and predicted APRs.

Main Results:

  • Few persistent interaction hotspots were identified, characterized by sustained stable contacts.
  • Interactions between Fab fragments significantly influenced conformational dynamics compared to single fragment simulations.
  • Incorporating solvent accessibility for surface hotspots and a predicted APR improved aggregation kinetics models across 49 conditions.

Conclusions:

  • Persistent interaction sites, including buried APRs, play a critical role in protein aggregation.
  • Molecular-level insights from MD simulations are valuable for protein engineering strategies.
  • Modulating these identified interactions can enhance protein product stability and therapeutic efficacy.