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Summary
This summary is machine-generated.

Temperature-cycle microscopy reveals distinct FRET states in polyproline and dsDNA. These states arise from linker dynamics and dye interactions, with a dark state linked to dye-dye proximity.

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Area of Science:

  • Biophysics
  • Chemical Physics
  • Materials Science

Background:

  • Previous studies observed Förster Resonance Energy Transfer (FRET) transitions in FRET-labeled polyprolines.
  • The conformational basis for these FRET transitions remained undetermined.

Purpose of the Study:

  • To elucidate the conformational origin of FRET states by comparing temperature-cycle microscopy responses of single FRET-labeled polyproline and double-stranded DNA (dsDNA) molecules.
  • To identify and characterize previously unobserved FRET states.

Main Methods:

  • Single-molecule FRET microscopy utilizing temperature-cycling protocols.
  • Comparative analysis of FRET distributions and temperature-cycle responses between polyproline and dsDNA samples.
  • Analysis of FRET state timescales and probabilities.

Main Results:

  • Distinct steady-state FRET distributions and temperature-cycle responses were observed for polyproline and dsDNA.
  • Temperature-cycle measurements revealed a 'dark state' not apparent in steady-state observations.
  • Comparison of FRET state dynamics allowed assignment of conformational heterogeneity to linker dynamics and dye-related interactions.

Conclusions:

  • Conformational heterogeneity in FRET-labeled molecules is significantly influenced by linker dynamics and dye-chain/dye-dye interactions.
  • The observed dark and low-FRET states are likely attributed to close-proximity dye-dye interactions.