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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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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Different dimerization affinity and orientation of fluorescent proteins eGFP and eYFP.

Yuna Kinoshita1, Yusuke Nakasone2, Masahide Terazima2

  • 1Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi, Chiba, Japan. haru@biomol.sci.toho-u.ac.jp.

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Subtle sequence changes in fluorescent proteins (FPs) like eGFP and eYFP significantly impact their dimerization affinity and orientation. This research aids in designing better Förster Resonance Energy Transfer (FRET) sensors.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Fluorescent protein (FP) oligomerization is essential for advanced imaging techniques but remains poorly understood.
  • Enhanced green fluorescent protein (eGFP) and enhanced yellow fluorescent protein (eYFP) are widely used FPs that differ by only five amino acid residues.

Purpose of the Study:

  • To investigate and quantify the dimerization affinity and orientation of eGFP and eYFP.
  • To understand how minor sequence variations influence FP oligomerization properties.
  • To provide insights for the rational design of Förster Resonance Energy Transfer (FRET) sensors.

Main Methods:

  • Size exclusion chromatography (SEC) to confirm monomer-dimer equilibrium.
  • Analytical ultracentrifugation (AUC) to determine dissociation constants (Kd).
  • Time-resolved fluorescence anisotropy to measure homo-Förster resonance energy transfer (FRET) dynamics and estimate Kd values.

Main Results:

  • Both eGFP and eYFP exist in a monomer-dimer equilibrium.
  • AUC revealed Kd values of 340 µM for eGFP and 20 µM for eYFP.
  • Fluorescence anisotropy measurements provided independent Kd estimates (740 µM for eGFP, 36 µM for eYFP) and transition dipole moment angles (32° for eGFP, 49° for eYFP).

Conclusions:

  • Minor sequence differences between eGFP and eYFP significantly alter their dimerization affinity and the relative orientation of subunits within homodimers.
  • These findings enable independent control over dimerization affinity and orientation, crucial for designing sophisticated FRET-based biosensors.