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The dynamic structure of thrombin in solution.

Brian Fuglestad1, Paul M Gasper, Marco Tonelli

  • 1Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California, USA.

Biophysical Journal
|July 26, 2012
PubMed
Summary
This summary is machine-generated.

Human alpha-thrombin

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Dynamics

Background:

  • Human alpha-thrombin is a key enzyme in blood coagulation.
  • Understanding its structural dynamics is crucial for drug development.
  • Previous studies suggested certain regions become rigid upon activation.

Purpose of the Study:

  • To investigate the backbone dynamics of inhibited human alpha-thrombin.
  • To identify dynamic regions and their timescales of motion.
  • To reconcile experimental findings with existing models of thrombin activation.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy (R(1), R(2), heteronuclear NOE, TROSY 2D [(1)H-(15)N] correlation spectra, R(ex) measurements).
  • Variable temperature experiments.
  • Accelerated molecular dynamics simulations.
  • Analysis of residual dipolar couplings.

Main Results:

  • The N-terminus of the heavy chain and the beta-barrel core are highly ordered.
  • Surface loops exhibit significant ps-ns timescale dynamics (order parameters as low as 0.5).
  • Regions previously thought to rigidify upon activation (e.g., gamma-loop, 180s loop) show significant dynamics.
  • Molecular dynamics simulations reveal motions up to milliseconds, particularly in the light chain and proximal loops.

Conclusions:

  • Human alpha-thrombin possesses significant backbone flexibility across multiple timescales.
  • Surface loops and specific internal regions remain dynamic even when inhibited.
  • Observed dynamics challenge previous assumptions about conformational changes during zymogen activation.