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- W2912595687 abstract "The functions of proteins have traditionally been linked to their well-defined three-dimensional, folded structures. It is becoming increasingly clear, however, that many proteins perform essential functions without being folded. Single-molecule spectroscopy provides new opportunities for investigating the structure and dynamics of such unfolded or ‘intrinsically disordered’ proteins (IDPs). The combination of single-molecule Förster resonance energy transfer (FRET) with nanosecond correlation spectroscopy, microfluidic mixing, and other advanced methods can be used to probe intra- and intermolecular distance distributions, reconfiguration dynamics, and interactions on a wide range of timescales, and even in heterogeneous environments, including live cells. I will illustrate the use of single-molecule FRET in combination with other biophysical methods in the context of an unexpected interaction mechanism that we recently discovered: The two intrinsically disordered human proteins histone H1 and its nuclear chaperone prothymosin α associate in a one-to-one complex with picomolar affinity, but they fully retain their structural disorder, long-range flexibility, and highly dynamic character. Based on the close integration of single-molecule experiments, NMR, and molecular simulations, we obtained a detailed picture of this complex that can be explained by the large opposite net charge of the two proteins without requiring defined binding sites or interactions between specific individual residues. This type of interaction has interesting ramifications for kinetic mechanisms of binding and cellular regulation." @default.
- W2912595687 created "2019-02-21" @default.
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- W2912595687 date "2019-02-01" @default.
- W2912595687 modified "2023-09-30" @default.
- W2912595687 title "Probing the Dynamics and Interactions of Disordered Proteins with Single-Molecule Spectroscopy" @default.
- W2912595687 doi "https://doi.org/10.1016/j.bpj.2018.11.107" @default.
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