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• W2135684502 endingPage "1315" @default.
• W2135684502 startingPage "1307" @default.
• W2135684502 abstract "We study the differences in folding stability of β-hairpin peptides, including GB1 hairpin and a point mutant GB1 K10G, as well as tryptophan zippers (TrpZips): TrpZip1, TrpZip2, TrpZip3-1, and TrpZip4. By performing replica-exchange molecular dynamics simulations with Amber03* force field (a modified version of Amber ff03) in explicit solvent, we observe ab initio folding of all the peptides except TrpZip3-1, which is experimentally known to be the least stable among the peptides studied here. By calculating the free energies of unfolding of the peptides at room temperature and folding midpoint temperatures for thermal unfolding of peptides, we find that TrpZip4 and GB1 K10G peptides are the most stable β-hairpins followed by TrpZip1, GB1, and TrpZip2 in the given order. Hence, the proposed K10G mutation of GB1 peptide results in enhanced stability compared to wild-type GB1. An important goal of our study is to test whether simulations with Amber 03* model can reproduce experimentally predicted folding stability differences between these peptides. While the stabilities of GB1 and TrpZip1 yield close agreement with experiment, TrpZip2 is found to be less stable than predicted by experiment. However, as heterogenous folding of TrpZip2 may yield divergent thermodynamic parameters by different spectroscopic methods, mismatching of results with previous experimental values are not conclusive of model shortcomings. For most of the cases, molecular simulations with Amber03* can successfully reproduce experimentally known differences between the mutated peptides, further highlighting the predictive capabilities of current state-of-the-art all-atom protein force fields. Proteins 2015; 83:1307–1315. © 2015 Wiley Periodicals, Inc." @default.
• W2135684502 created "2016-06-24" @default.
• W2135684502 creator A5034358356 @default.
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• W2135684502 date "2015-05-29" @default.
• W2135684502 modified "2023-10-14" @default.
• W2135684502 title "Folding thermodynamics of<i>β</i>-hairpins studied by replica-exchange molecular dynamics simulations" @default.
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• W2135684502 doi "https://doi.org/10.1002/prot.24827" @default.
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