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Area of Science:

  • Biophysics
  • Soft Matter Physics
  • Chemical Biology

Background:

  • Packing and crowding are key biological self-regulation mechanisms.
  • Collective signaling influences molecular and cellular processes.

Purpose of the Study:

  • To investigate how spatial packing affects the transition kinetics of internal molecular switches.
  • To understand the role of self-crowding in modifying macromolecular switching.

Main Methods:

  • Brownian dynamics simulations of Responsive Colloids.
  • Modeling internal degrees of freedom (particle size) in a bimodal energy landscape.
  • Analyzing self-consistent response to density fluctuations.

Main Results:

  • Self-crowding tunes macromolecular switching kinetics over an order of magnitude.
  • Demonstrated control over populations and transition times.
  • Observed exponential scaling of kinetics with packing.

Conclusions:

  • Spatial packing is a significant factor in regulating internal molecular switches.
  • The findings align with theoretical predictions combining Kramers' and liquid state theories.
  • This work provides insights into collective signaling and self-regulation in biological systems.