Protein-Protein Interactions in the Molecular Chaperone Network

Area of Science:

• Biochemistry
• Cell Biology
• Structural Biology

Background:

• Molecular chaperones are essential for maintaining protein homeostasis (proteostasis) by regulating protein folding, quality control, and turnover.
• A limited number of chaperones manage the complex proteome, necessitating efficient coordination mechanisms.
• Protein-protein interactions (PPIs) are crucial for coordinating chaperone functions and client protein management.

Purpose of the Study:

• To explore how protein-protein interactions (PPIs) within the molecular chaperone network regulate protein homeostasis.
• To investigate the role of PPIs in coordinating chaperone activities and client protein fate.
• To identify potential therapeutic strategies targeting chaperone PPIs for protein misfolding diseases.

Main Methods:

• Mapping and measuring PPIs within the molecular chaperone network.
• Utilizing structural biology techniques (X-ray crystallography, NMR, electron microscopy) to visualize chaperone PPIs.
• Employing chemical biology approaches, including high-throughput screening, to perturb and probe PPIs.

Main Results:

• Chaperone PPIs form organized complexes that facilitate client protein handoff and link to other cellular pathways.
• A wide range of PPI affinities and domain modules are involved, with competition for binding sites.
• Chemical probes that modulate specific PPIs have been developed and validated in cellular and animal models.

Conclusions:

• Regulation of PPIs is central to understanding chaperone-mediated proteostasis and decision-making.
• Chaperone PPIs represent promising targets for therapeutic intervention in protein misfolding diseases.
• Chemical modulation of chaperone PPIs offers a strategy to rebalance proteostasis.