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Updated: Jun 22, 2026
09:39
Mapping Dysfunctional Protein-Protein Interactions in Disease
Published on: October 24, 2025
Physicochemical principles that regulate the competition between functional and dysfunctional association of proteins
Sebastian Pechmann1, Emmanuel D Levy, Gian Gaetano Tartaglia
1Department of Chemistry, University of Cambridge, Cambridge, United Kingdom.
Summary
Protein interactions are governed by sequence properties, with interfaces prone to aggregation. Specific stabilizing interactions, like disulfide bonds, prevent uncontrolled protein assembly, maintaining homeostasis.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Science
Background:
- Protein homeostasis is crucial for cellular function.
- Quality control mechanisms like the unfolded protein response and heat shock response manage protein folding and assembly.
- Aberrant protein aggregation can lead to harmful consequences.
Purpose of the Study:
- To investigate the role of amino acid sequence physicochemical properties in regulating protein-protein interactions.
- To understand how these properties contribute to both functional complex formation and aggregation.
- To identify mechanisms that prevent uncontrolled protein association.
Main Methods:
- Systematic analysis of protein-protein complexes in the Protein Data Bank (PDB).
- Evaluation of interface regions for aggregation propensity compared to other surface areas.
- Identification of stabilizing interactions within aggregation-prone interfaces.
Main Results:
- Protein interface regions exhibit higher aggregation propensity than other surface areas.
- Forces driving functional complex formation (hydrophobic, electrostatic) can also drive abnormal association.
- Disulfide bonds and salt bridges stabilize aggregation-prone interfaces, preventing uncontrolled assembly.
Conclusions:
- Similar forces mediate both functional and dysfunctional protein associations.
- Specific stabilizing interactions are critical for regulating protein assembly and preventing aggregation.
- Physicochemical properties of amino acid sequences play a key role in protein interaction regulation.
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Overview