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Solution structure of native proteins with irregular folds from Raman optical activity.

E Smyth1, C D Syme, E W Blanch

  • 1Chemistry Department, University of Glasgow, Glasgow G12 8QQ, UK.

Biopolymers
|November 28, 2000
PubMed
Summary

Raman optical activity (ROA) spectroscopy distinguishes two protein disorder types: static and dynamic. Static disorder, seen in proteins like alpha-casein, involves fixed residue angles, while dynamic disorder, like in phosvitin, features interconverting conformers.

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Area of Science:

  • Biochemistry and Biophysics
  • Protein Structure Analysis
  • Spectroscopy

Background:

  • Proteins with irregular native folds present challenges in structural characterization.
  • Distinguishing different types of protein disorder is crucial for understanding function.
  • Raman optical activity (ROA) is a spectroscopic technique sensitive to molecular chirality.

Purpose of the Study:

  • To investigate the utility of ROA spectroscopy in differentiating types of protein disorder.
  • To analyze the conformational characteristics of proteins with irregular folds.

Main Methods:

  • Measurement of ROA spectra for hen phosvitin, yeast invertase, bovine alpha-casein, soybean Bowman-Birk protease inhibitor, and rabbit Cd(7)-metallothionein.
  • Comparison of ROA spectra with known disordered protein states (e.g., poly(L-lysine), poly(L-glutamic acid), unfolded lysozyme).

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Main Results:

  • ROA spectra successfully differentiated between two distinct types of protein disorder: static and dynamic.
  • Proteins like invertase, alpha-casein, Bowman-Birk inhibitor, and metallothionein exhibited static disorder.
  • Phosvitin displayed dynamic disorder, similar to unfolded proteins and molten globules.
  • The poly(L-proline) II (PPII) helix was identified as a significant conformational element in proteins with static disorder.

Conclusions:

  • ROA spectroscopy is a valuable tool for characterizing protein conformational disorder.
  • Static disorder is associated with fixed, non-repetitive Ramachandran angles, potentially involving PPII helices.
  • Dynamic disorder involves a distribution of Ramachandran angles and interconverting conformers.
  • The findings provide insights into the structural basis of protein plasticity and disorder.