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- W2320960388 abstract "Intrinsically disordered proteins (IDPs) are widespread and important in biology but defy the classical protein structure–function paradigm by being functional in the absence of a stable, folded conformation. Here we investigate the coupling between transient secondary and tertiary structure in the protein activator for thyroid hormone and retinoid receptors (ACTR) by rationally modulating the helical propensity of a partially formed α-helix via mutations. Eight mutations predicted to affect the population of a transient helix were produced and investigated by NMR spectroscopy. Chemical shift changes distant to the mutation site are observed in regions containing other transient helices indicating that distant helices are stabilized through long-range hydrophobic helix–helix interactions and demonstrating the coupling of transient secondary and tertiary structure. The long-range structure of ACTR is also probed using paramagnetic relaxation enhancements (PRE) and residual dipolar couplings, which reveal an additional long-range contact between the N- and C-terminal segments. Compared to residual dipolar couplings and PRE, modulation of the helical propensity by mutagenesis thus reveals a different set of long-range interactions that may be obscured by stronger interactions that dominate other NMR measurements. This approach thus offers a complementary and generally applicable strategy for probing long-range structure in disordered proteins." @default.
- W2320960388 created "2016-06-24" @default.
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- W2320960388 date "2013-06-25" @default.
- W2320960388 modified "2023-09-26" @default.
- W2320960388 title "Modulation of the Intrinsic Helix Propensity of an Intrinsically Disordered Protein Reveals Long-Range Helix–Helix Interactions" @default.
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- W2320960388 doi "https://doi.org/10.1021/ja4045532" @default.
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