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Folding Dynamics in a semiflexible Polymer as a Model of DNA

We studied the folding transition of a semiflexible homopolymer chain using a Brownian dynamics simulation. A duplex DNA chain exhibits a discrete transition between an elongated coil state and a folded state with toroidal morphology. We show that these folding properties are understood with the stiffness of DNA chains. Semiflexible chains fold through various paths into collapsed toroidal states stochastically. Some chains fold directly by winding around a ring along a chain. Others fold through rod states, which are kinetically trapped metastable states.