We study the conformational properties of heteropolymers containing two types of monomers A and B, modeled as self-attracting self-avoiding random walks on a regular lattice. Such a model can describe in particular the sequences of hydrophobic and hydrophilic residues in proteins [K. F. Lau and K. A. Dill, Macromolecules 22, 3986 (1989)] and polyampholytes with oppositely charged groups [Y. Kantor and M. Kardar, Europhys. Lett. 28, 169 (1994)]. Treating the sequences of the two types of monomers as quenched random variables, we provide a systematic analysis of possible generalizations of this model. To this end we apply the pruned-enriched Rosenbluth chain-growth algorithm, which allows us to obtain the phase diagrams of extended and compact states coexistence as function of both the temperature and fraction of A and B monomers along the heteropolymer chain.
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21 January 2014
Research Article|
January 21 2014
Conformational transitions in random heteropolymer models
Viktoria Blavatska;
Viktoria Blavatska
a)
1Institut für Theoretische Physik and Centre for Theoretical Sciences (NTZ),
Universität Leipzig
, Postfach 100920, D-04009 Leipzig, Germany
2
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
, 79011 Lviv, Ukraine
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Wolfhard Janke
Wolfhard Janke
b)
1Institut für Theoretische Physik and Centre for Theoretical Sciences (NTZ),
Universität Leipzig
, Postfach 100920, D-04009 Leipzig, Germany
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a)
Electronic addresses: Viktoria.Blavatska@itp.uni-leipzig.de and viktoria@icmp.lviv.ua
J. Chem. Phys. 140, 034904 (2014)
Article history
Received:
July 30 2013
Accepted:
December 02 2013
Citation
Viktoria Blavatska, Wolfhard Janke; Conformational transitions in random heteropolymer models. J. Chem. Phys. 21 January 2014; 140 (3): 034904. https://doi.org/10.1063/1.4849175
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