Folding-unfolding transition of active polymer on the reconfiguration of bidirectional tangential active force
arXiv:2509.17824 · doi:10.1021/acs.macromol.5c01098
Abstract
The role of active stress on the conformational dynamics of a polymer has drawn significant interest due to its potential applications in understanding the energy landscape of protein structures, buckling of biopolymers, genomic spatial organization, and their large scale coherent dynamics. We present a model of bidirectional active force that acts along the polymer's tangent, with its direction stochastically reversing between head to tail and tail to head orientations. The active polymer shows a structural transition from a random coil like state to a compressed state with variations in the active force, directional (polarity) reversal rate, and their fraction. Furthermore, the polymer re-swells and stretches more than its passive limit for a large active force. The polymer's radius of gyration follows the ideal chain-like scaling relation in both the compressed and swelled states. The bidirectional active force also drives dynamical transitions, where the effective diffusivity abruptly shifts from a linear to quadratic increase. Similarly, in the regime of large activity, the linear decrease of the longest relaxation time of the polymer changes to a power law behavior. We have shown that the active polymer's conformational, relaxation, and diffusive behaviors display a transition from an active polar linear polymer model (APLP) to an active Brownian particle (ABP) polymer model with the increase in the fraction of the opposite polarity and their reconfiguration time.
41 pages, 23 figures
References in corpus (31)
- Active Particles in Complex and Crowded Environments
- Physics of Microswimmers - Single Particle Motion and Collective Behavior
- Collective motion and nonequilibrium cluster formation in colonies of gliding bacteria
- Adaptive locomotion of artificial microswimmers
- Self-propelled Worm-like Filaments: Spontaneous Spiral Formation, Structure, and Dynamics
- The physics of active polymers and filaments
- Globule-like conformation and enhanced diffusion of active polymers
- Conformational properties of active semiflexible polymers
- How does a flexible chain of active particles swell?
- A self-driven phase transition drives Myxococcus xanthus fruiting body formation
- Dynamically Generated Patterns in Dense Suspensions of Active Filaments
- Colloidomers: freely-jointed polymers made of droplets
- Structure and dynamics of a self-propelled semiflexible filament
- Tuning the motility and directionality of self-propelled colloids
- Dynamics of active filaments in porous media
- Conformation and dynamics of a self-avoiding active flexible polymer
- Active Brownian filaments with hydrodynamic interactions: conformations and dynamics
- Active Brownian Motion with Directional Reversals
- Effects of inertia on conformation and dynamics of tangentially-driven active filaments
- Tangentially Driven Active Polar Linear Polymers -- An Analytical Study
- The Coil-Globule transition in self-avoiding active polymers
- Active dynamics and spatially coherent motion in chromosomes subject to enzymatic force dipoles
- Potential for modulation of the hydrophobic effect inside chaperonins
- Emergent dynamics due to chemo-hydrodynamic self-interactions in active polymers
- Statistical properties of a tangentially driven active filament
- Morphological and dynamical properties of semiflexible filaments driven by molecular motors
- Self-induced hydrodynamic coil-stretch transition of active polymers
- Delayed excitations induce polymer looping and coherent motion
- Characteristic features of self-avoiding active Brownian polymers under linear shear flow
- Activity-enhanced shear thinning of flexible linear polar polymers
- Folding-unfolding transition of active polymer on the reconfiguration of bidirectional tangential active force