Protein-complex stability in cells and in vitro under crowded conditions

Area of Science:

• Biophysics
• Biochemistry
• Cell Biology

Background:

• The intracellular environment is crowded, influencing biomolecular processes.
• Protein folding thermodynamics and kinetics are affected by cellular crowding.
• Understanding protein-protein interactions is crucial for cell biology.

Purpose of the Study:

• To review experimental studies on how cellular environments affect protein-protein interactions.
• To analyze theories explaining these effects on protein interaction energetics.
• To propose future research directions integrating experiments and simulations.

Main Methods:

• Review of quantitative, wet-experiment based studies.
• Analysis of effects of small molecules, synthetic polymers, and cosolutes.
• Examination of cellular interior effects on protein interactions.

Main Results:

• High concentrations of various molecules alter protein-protein interaction energetics.
• Crowding effects are observed with diverse small molecules, polymers, and in cellular environments.
• Existing theories provide frameworks for understanding these energetic changes.

Conclusions:

• Experimental data reveal significant impacts of the cellular milieu on protein-protein interactions.
• Further integration of experimental and simulation approaches is needed for a comprehensive understanding.
• This knowledge is vital for understanding cellular function and disease.