On the Helix-Coil transition in grafted chains

Details On the Helix-Coil transition in grafted chains On the Helix-Coil transition in grafted chains

1999-11-12

arxiv.org/abs/cond-mat/9911184v1

Europhys. Lett., 50 (6) pp.756-761 (2000).

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 1 figures, europhys.sty and euromacro.sty Submitted to Europhys. Lett

Scientific paper

10.1209/epl/i2000-00545-8

The helix-coil transition is modified by grafting to a surface. This modification is studied for short peptides capable of forming $\alpha$-helices. Three factors are involved: (i) the grafting can induced change of the boundary free energy of the helical domain (ii) the van der Waals attraction between the helices and (iii) the crowding induced stretching of the coils. As a result the helix-coil transition acquires ``all or nothing'' characteristics. In addition the transition temperature is elevated and the transition itself sharpens as the grafting density increases.

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