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Dynamics of proteins with different molecular structures under solution condition.

Rintaro Inoue1, Takashi Oda2,3, Hiroshi Nakagawa4,5

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Incoherent quasielastic neutron scattering (iQENS) reveals protein dynamics. Intrinsically disordered proteins (IDPs) show faster internal dynamics and higher hydrogen mobility than globular domain proteins (GDPs) in solution.

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Area of Science:

  • Biophysics
  • Neutron Scattering
  • Protein Dynamics

Background:

  • Incoherent quasielastic neutron scattering (iQENS) is a powerful technique for probing protein internal dynamics.
  • Studying protein dynamics in solution under physiological conditions has been challenging due to limitations in neutron flux, signal-to-noise ratio, and analysis methods.

Purpose of the Study:

  • To investigate and compare the internal dynamics of globular domain proteins (GDPs) and intrinsically disordered proteins (IDPs) in solution.
  • To leverage advancements in neutron sources, spectrometers, and computational methods for quantitative analysis of iQENS data.

Main Methods:

  • Utilized state-of-the-art iQENS spectrometers to measure protein dynamics.
  • Applied a newly developed analysis method to quantitatively reveal internal dynamics from iQENS profiles.
  • Performed structural analysis and calculated solvent accessible surface area of amino acid residues.

Main Results:

  • Intrinsically disordered proteins (IDPs) exhibited a higher average relaxation rate compared to globular domain proteins (GDPs).
  • IDPs demonstrated a significantly higher fraction of mobile hydrogen atoms than GDPs.
  • Internal dynamics were correlated with highly solvent-exposed amino acid residues, influenced by protein structure.

Conclusions:

  • The study successfully quantified differences in internal dynamics between IDPs and GDPs using iQENS.
  • The findings highlight the relationship between protein structure, solvent exposure, and internal molecular motion.
  • Advanced iQENS techniques and computational analysis enable detailed insights into protein dynamics in solution.