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Related Experiment Videos

Short-range spectroscopic ruler based on a single-molecule optical switch.

Mark Bates1, Timothy R Blosser, Xiaowei Zhuang

  • 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|March 24, 2005
PubMed
Summary

Researchers developed a novel all-optical switch using two molecules, Cy5 and Cy3, for precise single-molecule distance measurements. This switch acts as a molecular ruler, enabling new biomolecular studies.

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Area of Science:

  • Photonic devices
  • Spectroscopy
  • Biophysics

Background:

  • Single-molecule studies require precise distance measurements.
  • Conventional Förster resonance energy transfer (FRET) has limitations in probing certain distances.

Purpose of the Study:

  • To develop a novel all-optical switch for molecular distance measurements.
  • To create a molecular ruler capable of probing difficult-to-access distances.

Main Methods:

  • Utilizing a primary fluorophore (Cy5) switchable between fluorescent and dark states.
  • Employing a secondary chromophore (Cy3) to facilitate the switching mechanism.
  • Analyzing the distance-dependent interaction between Cy5 and Cy3.

Main Results:

Related Experiment Videos

  • Demonstrated a novel all-optical switch based on Cy5 and Cy3.
  • Observed a distance dependence significantly steeper than conventional FRET.
  • Validated the switch's capability as a molecular ruler.

Conclusions:

  • The developed all-optical switch offers a new tool for single-molecule biophysical studies.
  • This technology enables probing of molecular distances previously inaccessible by other methods.
  • The steep distance dependence enhances precision in molecular ruler applications.