Unfolded protein and peptide dynamics investigated with single-molecule FRET and correlation spectroscopy from picoseconds to seconds

The Journal of Physical Chemistry. B
Daniel NettelsBenjamin Schuler

Abstract

Single-molecule fluorescence spectroscopy and correlation methods are finding increasing applications in the investigation of biomolecular dynamics, especially together with Förster resonance energy transfer (FRET). Here, we use the combination of start-stop experiments and classical fluorescence correlation spectroscopy (FCS) to obtain complete intensity auto- and cross-correlation functions from picoseconds to seconds for investigating the dynamics of unfolded proteins and peptides. In combination with distance information from single-molecule transfer efficiency histograms, we can analyze the data in terms of a diffusive process on a potential of mean force to obtain intramolecular diffusion coefficients. This allows us to extend our previous analysis of the time scales of chain dynamics into the low nanosecond range for peptides and into the microsecond range for a small cold shock protein (Csp). Dynamics in short unstructured peptides can be detected down to a time scale of about 10 ns, placing a lower limit on the time scales accessible with correlation methods and currently used dye pairs. We find no evidence for microsecond fluctuations in unfolded Csp, suggesting that its global chain dynamics occur predominantly in th...Continue Reading

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