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Single-molecule photon stamping FRET spectroscopy study of enzymatic conformational dynamics

Single-molecule photon stamping FRET spectroscopy study of enzymatic conformational dynamics

Physical Chemistry Chemical Physics 15(3): 770-775

The fluorescence resonant energy transfer (FRET) from a donor to an acceptor via transition dipole-dipole interactions decreases the donor's fluorescent lifetime. The donor's fluorescent lifetime decreases as the FRET efficiency increases, following the equation: E(FRET) = 1 - τ(DA)/τ(D), where τ(D) and τ(DA) are the donor fluorescence lifetime without FRET and with FRET. Accordingly, the FRET time trajectories associated with single-molecule conformational dynamics can be recorded by measuring the donor's lifetime fluctuations. In this article, we report our work on the use of a Cy3/Cy5-labeled enzyme, HPPK to demonstrate probing single-molecule conformational dynamics in an enzymatic reaction by measuring single-molecule FRET donor lifetime time trajectories. Compared with single-molecule fluorescence intensity-based FRET measurements, single-molecule lifetime-based FRET measurements are independent of fluorescence intensity. The latter has an advantage in terms of eliminating the analysis background noise from the acceptor fluorescence detection leak through noise, excitation light intensity noise, or light scattering noise due to local environmental factors, for example, in a AFM-tip correlated single-molecule FRET measurements. Furthermore, lifetime-based FRET also supports simultaneous single-molecule fluorescence anisotropy.

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Accession: 055798483

Download citation: RISBibTeXText

PMID: 23085845

DOI: 10.1039/c2cp42944f

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