Thermal Properties of Water in Myoglobin Crystals and Solutions at Subzero Temperatures

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1986 Aug 1

PMID 3741983

Citations 40

Authors

W Doster

A Bachleitner

R Dunau

M Hiebl

E LUSCHER

Affiliations

Soon will be listed here.

Abstract

The water of hydration in myoglobin crystals and solutions was studied at subzero temperatures by calorimetry and infrared spectroscopy (ir). For comparison we also investigated glycine, DL-alanine and DL-valine solutions. The hydration water remains amorphous at low temperatures. We find a broad glass transition between 180 and 270 K depending on the degree of hydration. The ice component shows a noncolligative melting point depression that is attributed to a finite conformational flexibility. The ir spectrum and the specific heat of water in myoglobin crystals was determined for the first time between 180 and 290 K. The glass transition in crystals is qualitatively similar to what is found in amorphous samples at the same water content. These data are compared with Mössbauer experiments and dielectric relaxation of water in myoglobin crystals. The similar temperature dependencies suggest a cross correlation between structural fluctuations and the thermal motion of crystal water. A hydrogen bond network model is proposed to explain these features. The essential ingredients are cooperativity and a distribution of hydrogen-bonded clusters.

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