Characterization of the Free State Ensemble of the CoRNR Box Motif by Molecular Dynamics Simulations

The Journal of Physical Chemistry. B
Elio A CinoMikko Karttunen

Abstract

Intrinsically disordered proteins (IDPs) and regions are highly prevalent in eukaryotic proteomes, and like folded proteins, they perform essential biological functions. Interaction sites in folded proteins are generally formed by tertiary structures, whereas IDPs use short segments called linear motifs (LMs). Despite their short length and lack of stable structure, LMs may have considerable structural propensities, which often resemble bound-state conformations with targets. Structural data is crucial for understanding the molecular basis of protein interactions and development of targeted pharmaceuticals, but IDPs present considerable challenges to experimental techniques. As a result, IDPs are largely underrepresented in the Protein Data Bank. In the face of experimental challenges, molecular dynamics (MD) simulations have proven to be a useful tool for structural characterization of IDPs. Here, the free state ensemble of the nuclear receptor corepressor 1 (NCOR1) CoRNR box 3 motif, which is important for binding to nuclear receptors to control gene expression, is studied using MD simulations of a total of 8 μs. Transitions between disordered and α-helical conformations resembling a bound-state structure were observed throug...Continue Reading

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May 14, 2016·PLoS Computational Biology·Natalie S Scholes, Robert O J Weinzierl
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