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- W1978397464 abstract "Monte Carlo simulations were applied to β-hairpin folding of a valine-based peptide. Two valine residues in the middle of the peptide were substituted with glycine, to serve as turn residues. Unlike lattice model simulations, structure prediction methods, and unfolding simulations, our simulations used an atom-based model, constant temperature (274 K), and non-β-hairpin initial conformations. Based on the concept of solvent reference, the effective energy function simplified the solvent calculation and overcame the multiple minima problem. Driven by the hydrophobic interaction, the peptide first folded into a compact U-shaped conformation with a central turn, in analogy to the initial collapse with simultaneous nucleation in protein folding. The peptide units in the U-shaped conformation then reoriented, gradually forming hydrogen bonds in the β-hairpin pattern from the β-turn to the ends of the strands. With the same energy function, an alanine-based peptide folded into helix-dominated structures. The basic structure types (α-helix or β-hairpin) that formed during the simulations depended upon the amino acid sequence. Compared with helix, β-hairpin folding is driven mainly by the hydrophobic interaction. Hydrogen bonding is necessary to maintain the ordered secondary structure." @default.
- W1978397464 created "2016-06-24" @default.
- W1978397464 creator A5021096170 @default.
- W1978397464 date "1999-01-01" @default.
- W1978397464 modified "2023-10-12" @default.
- W1978397464 title "Monte Carlo Simulations of β-Hairpin Folding at Constant Temperature" @default.
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- W1978397464 doi "https://doi.org/10.1016/s0006-3495(99)77186-9" @default.
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