Knot Formation on DNA Pushed Inside Chiral Nanochannels.

Area of Science:

• Computational physics
• Polymer science
• Biophysics

Background:

• Understanding DNA polymer behavior is crucial in nanotechnology and synthetic biology.
• Previous studies explored polymer compression in finite knot factories.

Purpose of the Study:

• Investigate DNA polymer dynamics within infinite chiral and achiral channels.
• Analyze polymer metrics like span and monomer distribution.
• Compare infinite channel pushing to finite channel compression.

Main Methods:

• Coarse-grained molecular dynamics simulations.
• Modeling DNA polymers within open chiral and achiral channels.
• Analysis of polymer span, monomer distribution, and topological states.

Main Results:

• Polymer compression effects differ between chiral and achiral channels.
• Chiral channels promote the formation of equichiral knots.
• Knot handedness in chiral channels matches channel handedness.

Conclusions:

• Channel chirality significantly influences DNA polymer topology.
• Infinite open channels offer a distinct regime for studying polymer behavior.
• Equichiral knot formation highlights the role of geometric constraints in polymer self-organization.