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Conformational transitions monitored for single molecules in solution

L Edman¹, U Mets, R Rigler

¹Department of Medical Biophysics, Karolinska Institute, Stockholm, Sweden.

Proceedings of the National Academy of Sciences of the United States of America

|June 25, 1996

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Single-molecule fluorescence measurements reveal conformational transitions in DNA. This study observed dynamic changes in tetramethylrhodamine molecules interacting with DNA, providing insights into molecular behavior in solution.

Area of Science:

Biophysics
Molecular Biology
Chemical Physics

Background:

Macroscopic observations can obscure crucial single-molecule events.
Understanding molecular dynamics requires single-molecule analysis.

Purpose of the Study:

To investigate conformational transitions of tetramethylrhodamine (TMR) molecules at the single-molecule level.
To correlate observed fluorescence dynamics with molecular interactions in solution.

Main Methods:

Time-resolved, single-photon counting in a confocal fluorescence microscope.
Studying individual tetramethylrhodamine molecules attached to DNA during Brownian motion.
Utilizing fluorescence correlation spectroscopy (FCS).

Main Results:

Related Experiment Videos

Single-molecule fluorescence decay showed variable amplitudes, unlike bulk measurements.
Observed a stretched exponential relaxation law, indicating complex dynamics.
Correlated TMR fluorescence changes with guanosine interactions and conformational shifts.

Conclusions:

Single-molecule techniques reveal dynamic conformational transitions in solution.
Tetramethylrhodamine acts as a sensitive probe for molecular interactions and DNA conformational changes.
Findings are relevant to understanding biological processes at the molecular level.