The helix--coil transition on the worm--like chain

Details The helix--coil transition on the worm--like chain The helix--coil transition on the worm--like chain

2004-01-30

arxiv.org/abs/cond-mat/0401624v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

I propose a variation of the standard worm--like chain model to account for internal order parameter (helix/coil) fields on the polymer chain. This internal order parameter field influences polymer conformational statistics by locally modifying the persistence length of the chain. Using this model, I make predictions for the bending and stretching response of an alpha-helical domain of a protein. In particular, I show that alpha-helical protein domains will buckle under applied torque. This highly nonlinear elastic behavior may be important in the understanding of allosteric control of biochemical pathways.

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