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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Microsecond protein dynamics observed at the single-molecule level.

Takuhiro Otosu1, Kunihiko Ishii1,2, Tahei Tahara1,2

  • 1Molecular Spectroscopy Laboratory, RIKEN, 2-1, Hirosawa, Wako 351-0198, Japan.

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|July 8, 2015
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Summary
This summary is machine-generated.

Researchers developed a new single-molecule technique to observe microsecond protein dynamics. This method reveals crucial structural changes and transitions, advancing our understanding of protein folding and function.

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Area of Science:

  • Protein science
  • Biophysics
  • Structural biology

Background:

  • Understanding protein conformation is key to biological function.
  • Current single-molecule spectroscopy methods struggle to observe microsecond protein dynamics.
  • Microsecond dynamics are vital for elementary protein processes and experimental-simulation comparisons.

Purpose of the Study:

  • To develop a novel single-molecule technique for observing microsecond protein structural dynamics.
  • To apply this new method to investigate the conformational dynamics of cytochrome c.
  • To highlight the significance of quantifying microsecond dynamics in protein folding.

Main Methods:

  • Utilized single-molecule spectroscopy combined with fluorescence resonance energy transfer.
  • Developed and applied a new technique: two-dimensional fluorescence lifetime correlation spectroscopy (2D-FLCS).
  • Correlated fluorescence lifetime to reveal microsecond structural dynamics.

Main Results:

  • Successfully observed protein dynamics on the microsecond timescale.
  • Identified three distinct conformational ensembles in cytochrome c.
  • Revealed microsecond transitions within each conformational ensemble.
  • Demonstrated the importance of microsecond dynamics on the protein folding energy landscape.

Conclusions:

  • The new 2D-FLCS technique enables the study of previously inaccessible microsecond protein dynamics.
  • Cytochrome c exhibits complex conformational heterogeneity and dynamics on the microsecond timescale.
  • Quantifying microsecond dynamics is essential for a comprehensive understanding of protein folding and function.