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  • 1Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.

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Summary
This summary is machine-generated.

This study quantifies microsecond conformational exchange in large protein complexes using solid-state NMR. A paramagnetic agent enhanced signal, enabling analysis of protein dynamics in complexes like GB1-IgG.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Solid-state NMR is crucial for studying protein complex structure and dynamics.
  • Limitations in solubility and size often hinder analysis of large protein complexes.
  • Microsecond conformational exchange is a key dynamic process in proteins.

Purpose of the Study:

  • To develop and validate a method for quantifying microsecond conformational exchange in large protein complexes.
  • To overcome sensitivity limitations in solid-state NMR relaxation dispersion measurements.
  • To investigate the dynamics of the GB1-IgG complex.

Main Methods:

  • Utilized paramagnetic agents to accelerate 15N R1ρ relaxation dispersion measurements.
  • Applied the method to crystalline GB1 and a >300 kDa GB1-IgG complex.
  • Recorded relaxation dispersion curves on limited sample amounts (<50 μg) using 700 and 850 MHz spectrometers.

Main Results:

  • Paramagnetic agent increased signal-to-noise ratio by a factor of 5.
  • Successfully quantified microsecond conformational exchange in the GB1-IgG complex.
  • Observed similar exchange processes in the GB1 β-sheet in both crystalline and complex forms.
  • Detected differences in α-helix dynamics between crystalline GB1 and the GB1-IgG complex.

Conclusions:

  • The paramagnetic-assisted NMR approach enables efficient characterization of dynamics in large, challenging protein systems.
  • Conformational exchange mechanisms in GB1 are conserved between its crystalline form and when complexed with IgG.
  • The GB1-IgG complex exhibits distinct dynamics compared to crystalline GB1, particularly in α-helix regions.