http://www.cnr.it/ontology/cnr/individuo/prodotto/ID57495
Stochastic dynamics of model proteins on a directed graph (Articolo in rivista)
- Type
- Label
- Stochastic dynamics of model proteins on a directed graph (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevE.79.061925 (literal)
- Alternative label
Bongini L.; Casetti L.; Livi R.; Politi A.; Torcini A. (2009)
Stochastic dynamics of model proteins on a directed graph
in Physical review. E, Statistical, nonlinear, and soft matter physics (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Bongini L.; Casetti L.; Livi R.; Politi A.; Torcini A. (literal)
- Pagina inizio
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1) Dipartimento di Fisica, Università di Firenze, via Sansone 1, 50019 Sesto Fiorentino, Italy
2) Centro Interdipartimentale per lo Studio delle Dinamiche Complesse, via Sansone 1, 50019 Sesto Fiorentino, Italy
3) INFNSezione di Firenze, via G. Sansone 1, 50019 Sesto Fiorentino, Italy
4) Istituto dei Sistemi Complessi, CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy (literal)
- Titolo
- Stochastic dynamics of model proteins on a directed graph (literal)
- Abstract
- A method for reconstructing the potential energy landscape of simple polypeptidic chains is described. We show how to obtain a faithful representation of the energy landscape in terms of a suitable directed graph. Topological and dynamical indicators of the graph are shown to yield an effective estimate of the time scales associated with both folding and equilibration processes. This conclusion is drawn by comparing molecular dynamics simulations at constant temperature with the dynamics on the graph, defined as a temperature-dependent Markov process. The main advantage of the graph representation is that its dynamics can be naturally renormalized by collecting nodes into hubs while redefining their connectivity. We show that the dynamical properties at large time scales are preserved by the renormalization procedure. Moreover, we obtain clear indications that the heteropolymers exhibit common topological properties, at variance with the homopolymer, whose peculiar graph structure stems from its spatial homogeneity. In order to distinguish between fast and slow folders, one has to look at the kinetic properties of the corresponding directed graphs. In particular, we find that the average time needed to the fast folder for reaching its native configuration is two orders of magnitude smaller than its equilibration time while for the bad folder these time scales are comparable. (literal)
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