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Calculation of rigid-body conformational changes using restraint-driven Cartesian transformations.

P Sompornpisut1, Y S Liu, E Perozo

  • 1Department of Molecular Physiology and Biological Physics, University of Virginia Health Sciences Center, Charlottesville, Virginia 22906-0011, USA.

Biophysical Journal
|October 19, 2001
PubMed
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We developed a new method to calculate membrane protein conformational changes using limited distance data. This approach, applied to the KcsA channel, reveals a scissoring motion in transmembrane domains, simplifying structural analysis.

Area of Science:

  • Structural Biology
  • Biophysics
  • Computational Biology

Background:

  • Membrane proteins undergo conformational changes crucial for their function.
  • Determining these changes often requires extensive experimental data and computational resources.
  • Limited distance information presents a challenge in modeling protein dynamics.

Purpose of the Study:

  • To present a novel computational method for calculating membrane protein conformational changes.
  • To apply this method to understand the gating mechanism of the KcsA potassium channel.
  • To reduce the time and effort needed for modeling protein dynamics.

Main Methods:

  • Developed restraint-driven Cartesian transformations using relative distance changes.
  • Employed systematic sampling of rigid body movements in Cartesian space.

Related Experiment Videos

  • Utilized site-directed spin labeling and electron paramagnetic resonance (SDSL-EPR) for distance restraints.
  • Refined models using energy minimization.

    • Main Results:

    • Calculated the open conformation of KcsA's transmembrane domain 2 (TM2) using 10 SDSL-EPR distance restraints.
    • Revealed a scissoring-type motion of TM2 segments with a central pivot point.
    • Demonstrated the method's efficiency in determining conformational changes.

    Conclusions:

    • The restraint-driven Cartesian transformations method effectively models conformational changes in membrane proteins.
    • The scissoring motion elucidated provides insight into KcsA channel activation gating.
    • This approach can be integrated with molecular dynamics for broader applications in membrane protein structural studies.