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Macromolecular crowding increases structural content of folded proteins.

Michael Perham1, Loren Stagg, Pernilla Wittung-Stafshede

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, TX 77251, USA.

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|October 9, 2007
PubMed
Summary

Macromolecular crowding agents enhance protein secondary structure in folded states, increasing thermal stability. This suggests in vivo protein structures may differ from dilute buffer conditions, especially for less stable proteins.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Macromolecular crowding is a ubiquitous phenomenon in vivo.
  • Cellular environments are densely packed with macromolecules.
  • The effect of crowding on protein structure and stability is not fully understood under physiological conditions.

Purpose of the Study:

  • To investigate the in vitro effects of macromolecular crowding on the native-state secondary structure of two distinct proteins.
  • To assess the correlation between crowding-induced structural changes and protein thermal stability.
  • To evaluate the impact of crowding on unfolded-state structures.

Main Methods:

  • Circular dichroism spectroscopy was used to measure secondary structure content.
  • Thermal denaturation studies were performed to assess protein stability.
  • Experiments were conducted using alpha-helical VlsE and alpha/beta flavodoxin in the presence of Ficoll 70 at physiological conditions (pH 7, 20°C).

Main Results:

  • Macromolecular crowding significantly increased secondary structure content in the folded states of both VlsE (70% increase) and flavodoxin (33% increase) at 400 mg/ml Ficoll 70.
  • This enhancement in structural content correlated with increased protein thermal stability.
  • Crowding agents had minimal impact on the unfolded-state structures of the proteins.

Conclusions:

  • Macromolecular crowding can stabilize and enhance the native-state secondary structure of proteins.
  • The findings suggest that in vivo protein structures, particularly for intrinsically less stable proteins, may differ from those observed in dilute solution.
  • This study provides the first in vitro assessment of crowding effects on native-state protein structures under physiological conditions.