The Temperature Dependence of Internal Molecular Motions in Hydrated and Dry Alpha-amylase: the Role of Hydration Water in the Dynamical Transition of Proteins

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1999 Jan 23

PMID 9916035

Citations 37

Authors

J Fitter

Affiliations

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Abstract

Internal molecular motions of proteins are strongly affected by environmental conditions, like temperature and hydration. As known from numerous studies, the dynamical behavior of hydrated proteins on the picosecond time scale is characterized by vibrational motions in the low-temperature regime and by an onset of stochastic large-amplitude fluctuations at a transition temperature of 180-230 K. The present study reports on the temperature dependence of internal molecular motions as measured with incoherent neutron scattering from the globular water-soluble protein alpha-amylase and from a protein-lipid complex of rhodopsin in disk membranes. Samples of alpha-amylase have been measured in a hydrated and dehydrated state. In contrast to the hydrated sample, which exhibits a pronounced dynamical transition near 200 K, the dehydrated alpha-amylase does not show an appreciable proportion of stochastic large-amplitude fluctuations and no dynamical transition in the measured temperature range of 140-300 K. The obtained results, which are compared to the dynamical behavior of protein-lipid complexes, are discussed with respect to the influence of hydration on the dynamical transition and in the framework of the glass transition.

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