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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
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Shape-Dependent Global Deformation Modes of Large Protein Structures.

Gennady V Miloshevsky1, Ahmed Hassanein, Peter C Jordan

  • 1School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907, USA.

Journal of Molecular Structure
|June 8, 2010
PubMed
Summary

Normal mode analysis (NMA) reveals global protein motions during gating. New methods show standard NMA has limitations for studying protein gating transitions.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Pore-forming proteins regulate transport via conformational changes in response to stimuli.
  • Understanding protein gating mechanisms is crucial for various biological processes.

Purpose of the Study:

  • To identify and characterize the slowest motions in pore-forming proteins at the onset of gating.
  • To develop and apply new computational methods for studying protein gating transitions.
  • To assess the limitations of standard Normal Mode Analysis (NMA) in characterizing gating.

Main Methods:

  • Normal Mode Analysis (NMA) was applied to gA, KcsA, ClC-ec1, LacY, and LeuT(Aa) proteins.
  • New methods, all-atom Monte Carlo Normal Mode Following and Rotation-Translation of Protein Blocks (RTB), were developed and utilized.
  • These methods were applied to study gating transitions in gA and KcsA proteins.

Main Results:

  • Global deformation modes in most studied proteins resemble motions of an elastic rod; ClC-ec1 exhibits a splaying motion.
  • Standard NMA demonstrated significant limitations in characterizing the structural rearrangements during gating.
  • Comparison of all-atom and RTB methods highlighted the impact of rigid block approximations and the necessity of including all degrees of freedom.

Conclusions:

  • Protein gating involves global collective deformations influenced by protein shape.
  • Advanced computational methods are necessary to accurately capture the complexities of protein gating transitions.
  • Atomic-level details, pH, and residue interactions significantly affect large-scale conformational changes during gating.