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Titolo:
Molecular dynamics simulation of plastocyanin potential energy fluctuations: 1/f noise
Autore:
Bizzarri, AR; Cannistraro, S;
Indirizzi:
Univ Tuscia, Dipartimento Sci Ambientali, I-01100 Viterbo, Italy Univ Tuscia Viterbo Italy I-01100 Sci Ambientali, I-01100 Viterbo, Italy Univ Perugia, Dipartimento Fis, Unita INFM, I-06100 Perugia, Italy Univ Perugia Perugia Italy I-06100 s, Unita INFM, I-06100 Perugia, Italy
Titolo Testata:
PHYSICA A
fascicolo: 3-4, volume: 267, anno: 1999,
pagine: 257 - 270
SICI:
0378-4371(19990515)267:3-4<257:MDSOPP>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
INELASTIC NEUTRON-SCATTERING; SELF-ORGANIZED CRITICALITY; COPPER PLASTOCYANIN; GLASS-TRANSITION; MD SIMULATION; PROTEIN; WATER; MYOGLOBIN; INTERFACE; LYSOZYME;
Keywords:
1 f noise; protein dynamics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Cannistraro, S Univ Tuscia, Dipartimento Sci Ambientali, I-01100 Viterbo, Italy Univ Tuscia Viterbo Italy I-01100 I-01100 Viterbo, Italy
Citazione:
A.R. Bizzarri e S. Cannistraro, "Molecular dynamics simulation of plastocyanin potential energy fluctuations: 1/f noise", PHYSICA A, 267(3-4), 1999, pp. 257-270

Abstract

Molecular dynamics simulations of plastocyanin, an electron transfer copper containing protein involved in the photosynthetic process, have been performed in both the hydrated and dry state. An analysis of the potential energy fluctuations during a 500 ps dynamical evolution of the macromolecule reveals the presence of a 1/f(alpha) noise in the related spectral density. Such a phenomenon is shown to persist in a wide temperature range (from 100 to 300 K) for both the systems. The occurrence of 1/f(alpha) noise, which can be traced back to the existence, in protein systems, of thermally activated processes, seems to be a peculiarity of the dynamical behaviour of proteins. An analysis of the temperature dependence of the alpha exponent allowed us to extract information about the distribution of the conformational energy barriers and its dependence on the hydration level. (C) 1999 ElsevierScience B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 00:26:18