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Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
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Characterizing solution surface loop conformational flexibility of the GM2 activator protein.

Jeffery D Carter1, Jordan D Mathias, Edwin F Gomez

  • 1Department of Chemistry, University of Florida , P.O. Box 117200, Gainesville, Florida 32611-7200, United States.

The Journal of Physical Chemistry. B
|August 16, 2014
PubMed
Summary

The study reveals that GM2AP

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • GM2AP exhibits a β-cup topology with surface loops displaying multiple conformations in X-ray structures.
  • This conformational flexibility is hypothesized to be crucial for GM2AP's function in membrane binding, ligand extraction, or protein interactions.

Purpose of the Study:

  • To characterize the mobility and conformational flexibility of GM2AP structural regions in solution.
  • To investigate the role of conformational flexibility in GM2AP function.

Main Methods:

  • Site-directed spin labeling (SDSL) electron paramagnetic resonance (EPR) spectroscopy.
  • Molecular dynamics (MD) simulations.
  • Analysis of EPR line shapes using the microscopic order macroscopic disorder (MOMD) program.
  • Temperature-dependent EPR spectroscopy to determine thermodynamic parameters.

Main Results:

  • SDSL-EPR confirmed the presence of conformational flexibility in GM2AP surface loops in solution.
  • Multiple conformations were observed for some sites, consistent with X-ray crystallography data.
  • GM2 ligand binding did not significantly alter the conformational flexibility of the loops.
  • MD simulations corroborated the conformational heterogeneity observed via SDSL-EPR.

Conclusions:

  • The conformational flexibility of GM2AP surface loops is present in solution and is slow on the EPR timescale.
  • This inherent flexibility is likely important for GM2AP's functional mechanisms, independent of GM2 ligand binding.