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  • Title: Temperature dependence of dielectric relaxations in alpha-elastin coacervate: evidence for a peptide librational mode.
    Author: Urry DW, Henze R, Redington P, Long MM, Prasad KU.
    Journal: Biochem Biophys Res Commun; 1985 Apr 30; 128(2):1000-6. PubMed ID: 3994707.
    Abstract:
    The dielectric permittivity of alpha-elastin coacervate is reported over the frequency range of 1 MHz to 1000 MHz and the temperature dependence from 6.8 degrees C to 70 degrees C is also reported. A temperature-dependent simple Debye-type relaxation is observed with a correlation time of 8 nsec (40 degrees C) which is similar to that of the polypentapeptide of elastin (i.e. 7 nsec at 40 degrees C) where the band has been assigned to a peptide librational mode. By analogy this allows for the first assignment of a peptide librational mode in a naturally occurring polypeptide or protein. The strong spectrally localized band indicates a regularity of structure. The low temperature dependence of the correlation time, giving a 1.7 kcal/mole enthalpy of activation, is consistent with torsional motions associated with a peptide librational mode.
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