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• W1983684289 abstract "Evidence from a variety of spectroscopic probes indicates that (phi, psi) values corresponding to the left-handed polyproline II helix (P(II)) are preferred for short alanine-based peptides in water. On the basis of results from theoretical studies, it is believed that the observed preference is dictated by favorable peptide-solvent interactions, which are realized through formation of optimal hydrogen-bonding water bridges between peptide donor and acceptor groups. In the present study, we address this issue explicitly by analyzing the hydration structure and thermodynamics of 16 low-energy conformers of the alanine dipeptide (N-acetylalanine-N'-methylamide) in liquid water. Monte Carlo simulations in the canonical ensemble were performed under ambient conditions with all-atom OPLS parameters for the alanine dipeptide and the TIP5P model for water. We find that the number of hydrogen-bonded water molecules connecting the peptide group donor and acceptor atoms has no effect on the solvation thermodynamics. Instead, the latter are determined by the work done to fully hydrate the peptide. This work is minimal for conformations that are characterized by a minimal overlap of the primary hydration shells around the peptide donor and acceptor atoms. As a result, peptide-solvent interactions favor compact conformations that do not include P(II)-like geometries. Our main conclusion is that the experimentally observed preference for P(II) does not arise due to favorable direct interactions between the peptide and water molecules. Instead, the latter act to unmask underlying conformational preferences that are a consequence of minimizing intrapeptide steric conflicts." @default.
• W1983684289 created "2016-06-24" @default.
• W1983684289 creator A5030276329 @default.
• W1983684289 creator A5041647675 @default.
• W1983684289 creator A5068467452 @default.
• W1983684289 date "2004-02-04" @default.
• W1983684289 modified "2023-10-14" @default.
• W1983684289 title "Role of Solvent in Determining Conformational Preferences of Alanine Dipeptide in Water" @default.
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• W1983684289 doi "https://doi.org/10.1021/ja039051x" @default.
• W1983684289 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14982467" @default.
• W1983684289 hasPublicationYear "2004" @default.
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