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• W1994103685 abstract "There is a need for a fast, accurate, and reliable method of sampling the conformational space of peptides and proteins in order to obtain a balanced free-energy profile which can lead to our understanding of protein structure. We have utilized metadynamics for the conformational study of the solvated alanine dipeptide molecule, and our results show that the method has proven to be competent as a fast, robust, and reliable method for the conformation free-energy calculations of peptides in an explicit solvent, surpassing traditional methods such as umbrella sampling. We have also addressed the issue of the influence of different water models on the resulting free-energy profile in order to consistently decompose the setting of our simulation. All of the explicit water models for the simulation of biomolecules TIP3P, TIP4P, TIP4P/Ew, TIP5P, and SPCE have exhibited similar effects on the conformational preferences of alanine dipeptide with no significant differences. On the other hand, by comparing the potential energy surface in the gas phase and the free-energy surface in a water environment, we have shown that the interaction with water molecules is one of the most important structure-driving elements, with a great influence on the free-energy surface (FES) of the solvated peptide and the conformational preferences of the peptide backbone. All of the tested force fields (ff03, ff99SB, opls-aa, and charmm27) appreciably differ in the population of the individual conformers and the barriers between them. Significant divergence was found on both the potential energy surface (PES) as well as free-energy surface (FES) calculated by charmm27. We have therefore concluded that the differences originate dominantly from the parametrization of the peptide backbone in the given force field rather than from a noncovalent interaction with water molecules." @default.
• W1994103685 created "2016-06-24" @default.
• W1994103685 creator A5005232195 @default.
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• W1994103685 date "2010-04-02" @default.
• W1994103685 modified "2023-10-01" @default.
• W1994103685 title "Metadynamics As a Tool for Mapping the Conformational and Free-Energy Space of Peptides — The Alanine Dipeptide Case Study" @default.
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• W1994103685 doi "https://doi.org/10.1021/jp100950w" @default.
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