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Titolo:
Low-frequency vibrational modes in proteins: a neutron scattering investigation
Autore:
Bizzarri, AR; Paciaroni, A; Arcangeli, C; Cannistraro, S;
Indirizzi:
Univ Tuscia, Dipartimento Sci Ambientali, INFM, I-01100 Viterbo, Italy Univ Tuscia Viterbo Italy I-01100 bientali, INFM, I-01100 Viterbo, Italy Inst Max Von Laue Paul Langevin, INFM, Operat Grp Grenoble, F-38042 Grenoble, France Inst Max Von Laue Paul Langevin Grenoble France F-38042 Grenoble, France
Titolo Testata:
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
fascicolo: 6, volume: 30, anno: 2001,
pagine: 443 - 449
SICI:
0175-7571(200110)30:6<443:LVMIPA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLOBULAR-PROTEINS; GLASS-TRANSITION; WATER; MYOGLOBIN; DYNAMICS; SIMULATION; PLASTOCYANIN; BEHAVIOR;
Keywords:
protein dynamics; boson peak; plastocyanin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Cannistraro, S Univ Tuscia, Dipartimento Sci Ambientali, INFM, I-01100 Viterbo, Italy Univ Tuscia Viterbo Italy I-01100 I-01100 Viterbo, Italy
Citazione:
A.R. Bizzarri et al., "Low-frequency vibrational modes in proteins: a neutron scattering investigation", EUR BIOPHYS, 30(6), 2001, pp. 443-449

Abstract

The low-frequency dynamics of plastocyanin, an electron transfer copper protein, has been investigated by incoherent neutron scattering at different temperatures. The contribution to the dynamic structure factor arising fromH/D exchangeable and nonexchangeable protein protons has been evaluated byanalyzing two differently exchanged protein samples. The dynamic structurefactor of a hydrated plastocyanin sample with all the exchangeable hydrogens (about 150) replaced by deuterium exhibits an excess of vibrational modes, at about 3.5 meV, reminiscent of the boson peak found in other proteins and glassy systems. When only fast exchangeable hydrogens (about 50) are substituted by deuterium, the protein, besides the above-mentioned peak, shows an additional peak at about I meV. These vibrational peaks are discussed in connection with the topological disorder of the systems and the fluctuations of the intramolecular hydrogen bonds.

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Documento generato il 05/12/20 alle ore 01:01:02