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NMR Approaches to Identify Transient Structure and Interactions of Intrinsically Disordered Dynein Intermediate

Nikolaus M Loening1, Kayla A Jara2, Elisar J Barbar2

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Advanced nuclear magnetic resonance (NMR) techniques successfully mapped interactions and transient structures in intrinsically disordered proteins (IDPs), overcoming challenges in studying large protein complexes.

Keywords:
NMR spectroscopydyneinintrinsically disordered proteinsparamagnetic relaxation enhancementprotein–protein interactions

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Nuclear magnetic resonance (NMR) spectroscopy offers atomic-level insights into protein structures and interactions.
  • Studying large proteins with intrinsically disordered regions (IDPs) presents challenges due to spectral broadening and sensitivity to degradation.

Purpose of the Study:

  • To demonstrate advanced NMR methods for overcoming challenges in studying IDPs and their complexes.
  • To investigate the N-terminal region of the dynein intermediate chain (IC), which has both structured and disordered regions.

Main Methods:

  • Paramagnetic relaxation enhancement (PRE) NMR to probe conformational dynamics.
  • Water-amide chemical exchange to measure solvent accessibility.
  • Saturation transfer difference (STD) NMR to map interactions with p150Glued and Nudel.

Main Results:

  • Successfully applied advanced NMR techniques to analyze a large protein with both structured and disordered regions.
  • Identified novel transient structures and interaction networks within the dynein intermediate chain (IC).

Conclusions:

  • Advanced NMR techniques are effective for elucidating the dynamic behavior of IDPs and their complexes.
  • Provides valuable insights into the structural and functional roles of intrinsically disordered proteins.