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• W1993181211 abstract "Reverse turns, four-residue sections of polypeptides where the chain changes direction by about 180 degrees, are thought to be important protein folding initiation structures. However, the time scale and mechanism for their formation have yet to be determined experimentally. To develop a microscopic picture of the formation of protein folding initiation structures, we have carried out a pair of 2.2-ns molecular dynamics simulations of Tyr-Pro-Gly-Asp-Val, a peptide which is known to form a high population of reverse turns in water. In the first simulation, which was started with the peptide in an ideal type II reverse turn involving the first four residues, the turn unfolded after about 1.4 ns. After about 0.6 ns in the second simulation, which was started with the peptide in a fully extended conformation, the peptide folded into a type II turn which had a transient existence before unfolding. The peptide remained unfolded for another 0.9 ns before folding into a type I turn involving the last four residues. The type I turn lasted for about 0.2 ns before unfolding. Thus, these simulations showed that protein folding initiation structures can form and dissolve on the nanosecond time scale. Furthermore, the atomic-level detail of the simulations allowed us to identify some of the interactions which can stabilize the folded structures. The type II turns were stabilized by either a salt bridge between the terminal groups or a backbone-C-terminal group hydrogen bond, and the type I turns were stabilized by a hydrophobic interaction between the proline and valine-side chains." @default.
• W1993181211 created "2016-06-24" @default.
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• W1993181211 date "1991-06-18" @default.
• W1993181211 modified "2023-10-07" @default.
• W1993181211 title "Nanosecond timescale folding dynamics of a pentapeptide in water" @default.
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• W1993181211 doi "https://doi.org/10.1021/bi00238a032" @default.
• W1993181211 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2043643" @default.
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