Nonlinear wave trains in three-strand alpha-helical protein models

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Author list: Tabi CB, Fewu JCM, Fouda HPE, Mohamadou A, Kofane TC

Publisher: SpringerOpen

Place: NEW YORK

Publication year: 2013

Journal: The European Physical Journal B (1434-6028)

Journal acronym: EUR PHYS J B

Volume number: 86

Issue number: 9

Number of pages: 8

ISSN: 1434-6028

eISSN: 1434-6036

Languages: English-Great Britain (EN-GB)

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Abstract

Realistic models of alpha-helix proteins are composed of three covalently-bonded strands, each of which is made of hydrogen-bonded peptide units. The modulational instability analysis of such complex molecular systems is carried out in this work. We show that the exciton-vibron coupling parameter contributes to the explosion and expansion of instability regions. The right choice of the modulational instability parameters leads to the formation of excitonic modulated pulse-like structures. It is argued that covalent bonds are compressed during the process of energy transport, while hydrogen bond oscillations display regular trains of breather-like objects. We also argue that the probable way of energy transport, from modulational instability, is through hydrogen bonds.

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