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• W2332702024 endingPage "8463" @default.
• W2332702024 startingPage "8455" @default.
• W2332702024 abstract "Phosphorylation is an important mechanism regulating protein–protein interactions involving intrinsically disordered protein regions. Stathmin, an archetypical example of an intrinsically disordered protein, is a key regulator of microtubule dynamics in which phosphorylation of 63Ser within the helical nucleation sequence strongly down-regulates the tubulin binding and microtubule destabilizing activities of the protein. Experimental studies on a peptide encompassing the 19-residue helical nucleation sequence of stathmin (residues 55–73) indicate that phosphorylation of 63Ser destabilizes the peptide’s secondary structure by disrupting the salt bridges supporting its helical conformation. In order to investigate this hypothesis at atomic resolution, we performed molecular dynamics simulations of nonphosphorylated and phosphorylated stathmin-[55–73] at room temperature and pressure, neutral pH, and explicit solvation using the recently released GROMOS force field 54A7. In the simulations of nonphosphorylated stathmin-[55–73] emerged salt bridges associated with helical configurations. In the simulations of 63Ser phosphorylated stathmin-[55–73] these configurations dispersed and were replaced by a proliferation of salt bridges yielding disordered configurations. The transformation of the salt bridges was accompanied by emergence of numerous interactions between main and side chains, involving notably the oxygen atoms of the phosphorylated 63Ser. The loss of helical structure induced by phosphorylation is reversible, however, as a final simulation showed. The results extend the hypothesis of salt bridge derangement suggested by experimental observations of the stathmin nucleation sequence, providing new insights into regulation of intrinsically disordered protein systems mediated by phosphorylation." @default.
• W2332702024 created "2016-06-24" @default.
• W2332702024 creator A5001436183 @default.
• W2332702024 creator A5041503324 @default.
• W2332702024 creator A5043501747 @default.
• W2332702024 creator A5063856246 @default.
• W2332702024 date "2012-10-10" @default.
• W2332702024 modified "2023-10-01" @default.
• W2332702024 title "Influence of 63Ser Phosphorylation and Dephosphorylation on the Structure of the Stathmin Helical Nucleation Sequence: A Molecular Dynamics Study" @default.
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• W2332702024 doi "https://doi.org/10.1021/bi300885y" @default.
• W2332702024 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22978582" @default.
• W2332702024 hasPublicationYear "2012" @default.
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