Nonthermal fluctuations accelerate biomolecular motors.

Area of Science:

• Cell Biology
• Biophysics

Background:

• Intracellular transport is vital for cellular function, differing between prokaryotic and eukaryotic cells.
• Eukaryotic cells utilize molecular motors (kinesin, dynein) for active transport, complementing diffusion.
• Traditionally, diffusion was linked to thermal fluctuations (Brownian motion).

Purpose of the Study:

• To review the historical understanding of diffusive intracellular transport.
• To highlight the emerging role of nonthermal fluctuations in cellular transport mechanisms.
• To discuss how nonthermal fluctuations affect molecular motors and intracellular diffusion.

Main Methods:

• Literature review of historical and recent findings on intracellular transport.
• Analysis of studies on thermal and nonthermal fluctuations in cellular environments.
• Examination of research on molecular motor dynamics and metabolic activity.

Main Results:

• Nonthermal fluctuations, generated by metabolic activity, significantly contribute to intracellular diffusion.
• Molecular motors not only use thermal fluctuations but also leverage nonthermal fluctuations.
• Nonthermal fluctuations can accelerate the motion of molecular motors.

Conclusions:

• Intracellular transport mechanisms are more complex than previously thought, involving nonthermal fluctuations.
• Metabolic activity-driven fluctuations are a key factor in cellular transport efficiency.
• Future research should explore the broad impact of nonthermal fluctuations on cellular molecules.