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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • Optogenetics is crucial for neuroscience, enabling precise neural manipulation.
  • Existing optogenetic tools, like channelrhodopsins, have limitations in spectral sensitivity and photocurrent.
  • Previous attempts to re-engineer spectral sensitivity often sacrificed photocurrent or kinetics.

Purpose of the Study:

  • To develop a novel optogenetic tool with broadened spectral sensitivity.
  • To enhance neural excitation efficiency at shorter wavelengths.
  • To explore FRET-opsin mechanisms for improved optogenetic tool performance.

Main Methods:

  • Developed ChroME-mTFP, a fusion of a rhodopsin and a fluorescent protein.
  • Utilized Förster resonance energy transfer (FRET) to drive photocurrent.
  • Characterized the activation spectrum, photocurrent, and kinetics of the engineered tool.

Main Results:

  • ChroME-mTFP broadened the activation spectrum of ChroME by ~50 nm towards shorter wavelengths.
  • Achieved higher photocurrent at blue-shifted excitation wavelengths without sacrificing kinetics.
  • Demonstrated potential for lower power, blue-shifted neural excitation and improved dual-channel optogenetics.

Conclusions:

  • The FRET-opsin mechanism successfully broadened spectral sensitivity while preserving photocurrent and kinetics.
  • ChroME-mTFP offers advantages for optogenetic stimulation at shorter wavelengths and lower powers.
  • Further development is needed to mitigate crosstalk from longer wavelengths for imaging applications.