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Spectroscopy
Volume 24 (2010), Issue 3-4, Pages 201-205
http://dx.doi.org/10.3233/SPE-2010-0464

Low frequency dynamics of lysozyme: A Raman scattering and low temperature specific heat study

C. Crupi,1,3 G. D'Angelo,1 U. Wanderlingh,1 V. Conti Nibali,1 and C. Vasi2

1Department of Physics, University of Messina, Messina, Italy
2IPCF-CNR, University of Messina, Messina, Italy
3Department of Physics, University of Messina, via Stagno D'Alcontres 31, 98166 Messina, Italy

Copyright © 2010 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Raman scattering and low temperature specific heat (Cp) measurements have been performed to investigate the low frequency vibrational dynamics of hen egg white dry lysozyme. The occurrence of low energy extra excitations have been revealed both in the light scattering spectrum and in the Cp/T3 vs. T plot. A perfect agreement in the frequency and temperature position of the Boson Peak in this protein has been observed. At temperature below 3 K it has been found a contribution to the specific heat similar to that revealed in glassy systems. This, together with the other analogies discovered between thermal properties of amorphous and biological systems, suggests the possibility of making the most of the knowledge about the former in order to understand some glassy-like behaviours of proteins.