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Protein Folding01:22

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Purification of the Sarco-Endoplasmic Reticulum Ca2+-ATPase from Rabbit Muscle
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The trehalose coating effect on the internal protein dynamics.

Christiane Hackel1, Tatyana Zinkevich, Peter Belton

  • 1University of Halle, Institute of Physics, Betty-Heimann-Str., 7, 06120, Halle, Germany.

Physical Chemistry Chemical Physics : PCCP
|January 20, 2012
PubMed
Summary

Trehalose stabilizes cold shock protein (Csp) structure and dynamics, but non-native hydrogen bonds persist. Hydration affects protein dynamics differently based on N-H and C-H groups due to hydrogen bonding capabilities.

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Area of Science:

  • Biophysics
  • Structural Biology
  • NMR Spectroscopy

Background:

  • Cold shock proteins (Csp) are crucial for cellular adaptation to cold stress.
  • Understanding protein behavior in dehydrated and glassy states is vital for preservation and function.

Purpose of the Study:

  • To comparatively study the structural features and internal dynamics of cold shock protein (Csp) in lyophilized powder versus a trehalose matrix.
  • To investigate the effects of rehydration on Csp structure and dynamics in both states.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) experiments, including (15)N and (13)C labeling.
  • Measurement of relaxation rates (R(1), R(1ρ)) and dipolar couplings.
  • Solid-state exchange method to detect chemical shift anisotropy tensor reorientation.

Main Results:

  • Trehalose coating better preserves native protein structure compared to lyophilized powder, though some non-native hydrogen bonds remain.
  • Trehalose slows backbone N-H group dynamics (nanosecond to microsecond timescales) without altering motional amplitude.
  • Water accumulation in Csp-trehalose mixtures leads to faster protein dynamics, approaching but not reaching fully hydrated states.
  • Differential hydration response observed: N-H groups show decreased correlation times with stable amplitude, while CH(CH(2)) groups exhibit increased motional amplitude with unchanged correlation times.

Conclusions:

  • Trehalose offers partial structural stabilization and modulates internal protein dynamics.
  • Water acts as a plasticizer, influencing protein mobility differently based on local chemical environment and hydrogen bonding potential.
  • The distinct hydration responses of N-H and CH(CH(2)) groups highlight the role of hydrogen bonding in protein dynamics.