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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

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Topologically Linked Chains in Confinement.

Giulia Amici¹, Michele Caraglio², Enzo Orlandini³

¹SISSA, International School for Advanced Studies, via Bonomea 265, I-34136 Trieste, Italy.

ACS Macro Letters

|June 2, 2022

Summary

This summary is machine-generated.

Channel confinement impacts linked polymers. Linking keeps polymer rings intertwined even under strong confinement, unlike unlinked rings. This behavior is key for DNA unlinking in bacteria.

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Area of Science:

Polymer physics
Biophysics
Computational chemistry

Background:

Topological entanglement is crucial for polymer behavior.
Understanding how confinement influences these properties is essential for biological processes.

Purpose of the Study:

To investigate the effect of channel confinement on topologically linked and unlinked ring polymers.
To identify unique properties of linked polymers under confinement.

Main Methods:

Extensive simulations of semiflexible rings.
Varying chain length (N) and channel diameter (D).

Main Results:

Linked portion length becomes independent of chain length in weak confinement.
Linked portion remains significantly large even under strong confinement, unlike unlinked rings.
Linked portion length scales with channel diameter as D^0.5.

Conclusions:

Linking imparts distinct equilibrium properties to polymers under confinement.
These findings are relevant for DNA topology management in bacteria and experimental studies using microchannels.