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Related Experiment Videos

Conformational spectra--probing protein conformational changes.

N Errington1, O Byron, A J Rowe

  • 1NCMH Business Centre, School of Biological Sciences, University of Nottingham, Sutton Bonington, Leicestershire LE12 5RD, UK. neil.errington@nottingham.ac.uk

Biophysical Chemistry
|October 13, 2006
PubMed
Summary
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This study demonstrates a novel analytical ultracentrifuge method to precisely determine protein molecular weights and analyze multiple protein conformations within a single sample. The approach enhances the detection of subtle conformational changes under varying conditions.

Area of Science:

  • Biophysics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Analytical ultracentrifugation (AUC) sedimentation velocity (SV) mode can determine protein molecular weights.
  • Previous methods by Stafford offered ~5% precision for molecular weight determination using Gaussian fits to g(s*) profiles.
  • Analysis of complex systems or conformational changes requires robust methods.

Purpose of the Study:

  • To develop a new approach for analyzing systems with multiple distinguishable conformations of a single protein species using AUC.
  • To validate the Stafford relationship for various protein solutes and Schlieren data.
  • To enable sensitive detection of conformational changes under different solvent conditions or between protein variants.

Main Methods:

  • Utilizing analytical ultracentrifuge in sedimentation velocity mode.

Related Experiment Videos

  • Applying the Stafford relationship by fitting Gaussian distributions to g(s*) profiles.
  • Computing g(s*) profiles from Schlieren (dc/dr vs. r) data using the Bridgman equation.
  • Analyzing systems with multiple conformers in the same or different sample cells.

    • Main Results:

    • The Stafford relationship was found to hold for a range of protein solutes.
    • Good agreement was observed when g(s*) profiles were computed from Schlieren data using the Bridgman equation.
    • A new method was developed to analyze systems with two or more distinguishable conformations of a single species.

    Conclusions:

    • The developed AUC approach allows for the analysis of multiple protein conformers in solution under identical solvent conditions.
    • High sensitivity detection of conformational changes is possible when transitioning between solvent conditions or comparing protein variants.
    • This method provides a powerful tool for studying protein dynamics and conformational heterogeneity.