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Related Experiment Videos

Cytosol has a small effect on protein backbone dynamics.

Julie E Bryant1, Juliette T J Lecomte, Andrew L Lee

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, USA.

Biochemistry
|August 16, 2006
PubMed
Summary

Protein dynamics in E. coli cytosol were studied using nuclear magnetic resonance spectroscopy. The study found that cellular environments quantitatively affect protein relaxation but do not alter the fundamental backbone dynamics of apocytochrome b5.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cellular Biophysics

Background:

  • Cellular environments are crowded with macromolecules, influencing protein behavior.
  • Most protein biophysical data is derived from dilute solutions, not native cellular conditions.

Purpose of the Study:

  • To investigate the impact of the cellular environment on protein backbone dynamics.
  • To compare protein dynamics in living E. coli cytosol versus dilute solution.

Main Methods:

  • Utilized nuclear magnetic resonance (NMR) spectroscopy to measure (15)N T(1) and T(2) relaxation times and {(1)H}-(15)N nuclear Overhauser enhancement (nOe).
  • Studied uniformly (15)N-enriched apocytochrome b(5) in both living E. coli and dilute solution.
  • Applied the model-free approach for data analysis.

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Main Results:

  • Cytosolic environment quantitatively affected T(1), T(2), and nOe values compared to dilute solution.
  • Observed increases in overall correlation time due to higher cytosolic viscosity.
  • Picosecond and millisecond motions showed increases of less than 30%.

Conclusions:

  • The cellular cytosol does not fundamentally alter the pattern of apocytochrome b(5) backbone dynamics.
  • Cytosolic viscosity is the primary factor influencing observed changes in protein dynamics.
  • Protein dynamics in vivo are largely consistent with dilute solution studies, albeit with quantitative modifications.