Crystaline Toroidal Globules of DNA and other Semi-flexible Polymers: Jumps in Radius Caused by Hexagonal Packing

Date

2000

Authors

Pereira, G.
Williams, David

Journal Title

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Volume Title

Publisher

Les Editions de Physique

Abstract

We study a single semiflexible polymer chain immersed in a poor solvent. Such chains are stiff and are known to form toroidal globules. Here we examine the effects of hexagonally ordered packing of the chains. This packing induces a series of sharp transitions in the circuit number (number of complete circuits of the toroid) and major radius of the torus as a function of chain length. Circuit numbers corresponding to closed shells are strongly favoured and circuit numbers corresponding to a spare loop are forbidden. The potential landscape as a function of the circuit number consists of a series of minima separated by barriers. In some cases these barriers may be high enough to produce long-lived non-equilibrium tori.

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Citation

Source

Europhysics Letters

Type

Journal article

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DOI

10.1209/epl/i2000-00306-3

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