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Related Experiment Videos

Anisotropic rotational diffusion in model-free analysis for a ternary DHFR complex.

M J Osborne1, P E Wright

  • 1Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Journal of Biomolecular NMR
|May 2, 2001
PubMed
Summary
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Rotational anisotropy in proteins significantly impacts model-free analysis of NMR data, introducing errors in motion interpretation. A new method, COPED, helps distinguish true protein dynamics from anisotropy effects for accurate functional insights.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Model-free analysis of NMR relaxation data is standard for studying protein dynamics.
  • Understanding protein internal motions is crucial for elucidating protein function.

Purpose of the Study:

  • To analyze the impact of rotational anisotropy on model-free analysis of a dihydrofolate reductase (DHFR) ternary complex.
  • To develop a method for differentiating true protein motions from artifacts caused by anisotropy.

Main Methods:

  • Detailed analysis of NMR relaxation data from DHFR.
  • Application of model-free analysis assuming both isotropic and anisotropic tumbling.
  • Development and application of the COPED (COmparison of Predicted and Experimental Diffusion tensors) procedure.

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Main Results:

  • Even minor DHFR rotational anisotropy (Dparallel/Dperpendicular = 1.18) led to erroneous motional models in over 50% of analyzed spins.
  • Systematic changes in order parameters (S2) were observed, up to 0.08 for some residues.
  • The COPED procedure accurately distinguished anisotropy effects from genuine slow motions, aligning with axially symmetric model-free analysis.

Conclusions:

  • Neglecting rotational diffusion anisotropy in high-quality NMR data introduces significant errors into model-free analysis.
  • These errors can lead to misinterpretations of protein internal motions and their functional roles.
  • The COPED method provides a reliable, independent approach for assessing rotational diffusion and protein dynamics.