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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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A low-resolution low-temperature neutron diffraction study of myoglobin.

B V Daniels1, B P Schoenborn, Z R Korszun

  • 1Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.

Acta Crystallographica. Section D, Biological Crystallography
|August 10, 2004
PubMed
Summary

This study measured myoglobin crystal expansion across temperatures, revealing a linear thermal expansion coefficient of 45 x 10(-6) K(-1) and identifying lattice disorder onset at 180 K.

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Area of Science:

  • Structural biology
  • Biophysics
  • Crystallography

Background:

  • Understanding protein thermal expansion is crucial for structural biology.
  • Myoglobin's hydration layers influence its crystal lattice dynamics.

Purpose of the Study:

  • To determine the linear coefficient of thermal expansion for myoglobin.
  • To investigate temperature-dependent changes in myoglobin crystal structure and hydration.

Main Methods:

  • X-ray diffraction data collection at various temperatures (80 K to 240 K).
  • Analysis of unit-cell parameter expansion to calculate thermal expansion coefficient.
  • Shell solvent model application to describe hydration layers.
  • Difference Fourier map calculations to identify structural changes.

Main Results:

  • Myoglobin exhibits a linear thermal expansion coefficient of 45 x 10(-6) K(-1).
  • A concerted lattice disorder effect, indicative of disorder onset, was observed at 180 K.
  • Difference maps revealed minimal changes within the protein but significant features in the solvent region and at crystal lattice interfaces.

Conclusions:

  • The shell solvent model provides a reasonable approximation for calculating myoglobin's thermal expansion.
  • The study identifies 180 K as a critical temperature for the onset of extended lattice disorder in myoglobin crystals.
  • Temperature-dependent diffraction analysis offers insights into protein crystal dynamics and hydration effects.