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- W1996568821 abstract "We have measured the fluorescence spectra of a single fluorophore attached to a single protein molecule in aqueous solution using a total internal reflection fluorescence microscope. The most reactive cysteine residue of myosin subfragment-1 (S1) was labeled with tetramethylrhodamine. The spectral shift induced by a change in solvent from aqueous buffer to methanol in both single-molecule and bulk measurements were similar, indicating that, even at the single molecule level, the fluorescence spectrum is sensitive to microenvironmental changes of fluorophores. The time dependence of the fluorescence spectra of fluorophores attached to S1 molecules solely showed a fluctuation with time over a time scale of seconds. Because the fluorescence spectra of the same fluorophores directly conjugated to a glass surface remained constant, the spectral fluctuation observed for the fluorophores attached to S1 is most likely due to slow spontaneous conformational changes in the S1 molecule. Thus, single-molecule fluorescence spectroscopy appears to be a powerful tool to study the dynamic behavior of single biomolecules." @default.
- W1996568821 created "2016-06-24" @default.
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- W1996568821 date "2000-03-01" @default.
- W1996568821 modified "2023-10-15" @default.
- W1996568821 title "Spectral Fluctuation of a Single Fluorophore Conjugated to a Protein Molecule" @default.
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- W1996568821 doi "https://doi.org/10.1016/s0006-3495(00)76708-7" @default.
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