Single Chain Force Spectroscopy: Sequence Dependence

Details Single Chain Force Spectroscopy: Sequence Dependence Single Chain Force Spectroscopy: Sequence Dependence

2001-10-29

arxiv.org/abs/cond-mat/0110581v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages 3 figures

Scientific paper

10.1209/epl/i2002-00584-7

We study the elastic properties of a single A/B copolymer chain with a specific sequence. We predict a rich structure in the force extension relations which can be addressed to the sequence. The variational method is introduced to probe local minima on the path of stretching and releasing. At given force, we find multiple configurations which are separated by energy barriers. A collapsed globular configuration consists of several domains which unravel cooperatively. Upon stretching, unfolding path shows stepwise pattern corresponding to the unfolding of each domain. While releasing, several cores can be created simultaneously in the middle of the chain resulting in a different path of collapse.

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