Dynamics of active semiflexible polymers.

Area of Science:

• Biophysics
• Soft Matter Physics
• Cellular Biophysics

Background:

• Living cells exhibit active fluctuations driven by ATP-consuming molecular motors.
• These motors often interact with biopolymers, such as semiflexible chains, influencing their dynamics.
• Understanding these active processes is crucial for comprehending cellular mechanics and organization.

Purpose of the Study:

• To theoretically analyze the active fluctuations of semiflexible polymers out of thermal equilibrium.
• To investigate the conditions leading to enhanced diffusion and spatial correlations in these systems.
• To explore the role of the interplay between polymer elasticity and motor activity.

Main Methods:

• Theoretical analysis using analytical methods.
• Computational simulations to model polymer dynamics.
• Investigation of the temporal regimes defined by thermal modes and activity timescales.

Main Results:

• Enhanced and superdiffusive behavior observed in a specific temporal regime.
• A dynamic resonance-like condition identified between elastic modes and active force duration.
• Increased spatial correlation of local displacements due to the elasticity-activity interplay.

Conclusions:

• The interplay between elasticity and activity drives long-range correlations in semiflexible polymers.
• Findings align with observations of cytoskeletal biopolymers and chromatin dynamics.
• This mechanism may be fundamental to cellular processes involving active polymer networks.