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Circular dichroic study of conformational changes in ovalbumin.

P P Batra1, K Sasa, T Ueki

  • 1Department of Biochemistry, Wright State University, Dayton, Ohio 45435.

Journal of Protein Chemistry
|April 1, 1989
PubMed
Summary

Ovalbumin

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Area of Science:

  • Biochemistry
  • Protein structure analysis

Background:

  • Ovalbumin is a major protein in egg white.
  • Understanding protein conformational changes is crucial in biochemistry.

Purpose of the Study:

  • To investigate the conformational stability of ovalbumin.
  • To determine the effects of denaturants on ovalbumin structure.

Main Methods:

  • Circular dichroism (CD) spectroscopy was used to analyze protein structure.
  • Simulations of CD spectra were performed using established methods.
  • Reference spectra were utilized for comparison.

Main Results:

  • Native ovalbumin contains approximately 33% alpha-helix, 5% beta-structure, and 62% random coil.
  • Ovalbumin showed resistance to urea and SDS but underwent denaturation in guanidine.
  • Denaturation in guanidine led to a significant increase in random coil structure.

Conclusions:

  • Ovalbumin exhibits distinct conformational changes in response to different denaturants.
  • The protein does not fully recover its native structure after denaturation.
  • Denaturation results in a destabilized helical structure.

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