A Conceptual Framework for Integrating Cellular Protein Folding, Misfolding and Aggregation

Area of Science:

• Biochemistry
• Cell Biology
• Biophysics

Background:

• Protein misfolding and aggregation are critical cellular challenges.
• Aggregation is often viewed as a consequence of misfolding.
• Current understanding of cellular protein homeostasis is incomplete.

Purpose of the Study:

• To distinguish protein folding from protein aggregation as independent processes.
• To elucidate the mechanisms underlying protein aggregation inhibition.
• To provide new insights into cellular protein landscapes.

Main Methods:

• Theoretical analysis of intermolecular forces in cellular environments.
• Examining the role of attractive and repulsive forces in protein stabilization.
• Investigating the intrinsic chaperone activity of cellular macromolecules.

Main Results:

• Protein aggregation is an independent process from protein folding.
• Intermolecular repulsions (excluded volume, surface charges) are key to preventing aggregation.
• Cellular macromolecules possess generic intrinsic chaperone activity via repulsive forces.

Conclusions:

• Distinguishing folding and aggregation is crucial for understanding cellular protein behavior.
• Repulsive forces from cellular macromolecules play a significant role in inhibiting protein aggregation.
• This framework offers new perspectives on managing protein aggregation in cellular systems.