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4D Imaging of Protein Aggregation in Live Cells
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Protein folding dynamics in the cell.

Irisbel Guzman1, Martin Gruebele

  • 1Department of Biochemistry, University of Illinois , Urbana, Illinois 61801, United States.

The Journal of Physical Chemistry. B
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Summary
This summary is machine-generated.

Living cells can fine-tune protein folding landscapes, influencing protein function beyond genetic and chemical modifications. This modulation, though small, significantly impacts cellular processes and proteome control.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Molecular Biology

Background:

  • Protein folding is a rapid process with small energy barriers.
  • Cells possess mechanisms to control protein function beyond genetic and post-translational modifications.
  • The cellular environment can influence protein stability and folding landscapes.

Purpose of the Study:

  • To explore physicochemical studies of protein stability and folding within living cells.
  • To investigate how cellular environments modulate protein free energy landscapes.
  • To highlight the potential of in-cell modulation for controlling proteome function.

Main Methods:

  • Utilizing fast relaxation imaging (FREI) to study protein folding dynamics.
  • Analyzing the effects of the cellular environment on protein free energy landscapes.
  • Quantifying the impact of small energy and entropy modulations on protein populations.

Main Results:

  • The cellular environment exerts subtle (few kT) but significant effects on protein free energy landscapes.
  • Strong cooperativity in folding and binding processes amplifies small modulations into large population changes.
  • In-cell modulation offers a novel layer of control over protein function.

Conclusions:

  • Cells can actively modulate protein landscapes, complementing existing regulatory mechanisms.
  • Understanding in-cell modulation is crucial for quantitative physical chemistry and cellular control.
  • Biomolecular processes are likely candidates for exhibiting significant responses to in-cell modulation.