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- W2017598128 abstract "CD spectroscopy is often used to elucidate the secondary structure of peptides built from non-natural amino acids such as β-amino acids. The interpretation of such CD spectra is not always unambiguous. Here, we present a case where two β-hexapeptides, a dimethyl-β-hexapeptide indicated as DM-BHP (A) and its nonmethylated analogue indicated as BHP (B), exhibit similar CD spectra, whereas they are expected to differ in secondary structure. The structural properties of both peptides were studied by molecular dynamics simulation, and from the resulting trajectories, the corresponding CD spectra were calculated. Starting from a fully extended conformation, BHP is observed to form a 314-helix, while DM-BHP remains unfolded. However, even though these two peptides hardly share any conformations, their calculated CD spectra are alike and show the same features as the experimentally measured ones. Our results imply that a particular CD pattern can be induced by spatially different structures, which makes it difficult to derive the conformational preference of a peptide from its CD spectrum alone. To gain more insight into the relationship between the preferred conformation of a peptide and its CD spectrum, more accurate methods to calculate the CD spectrum for a given conformation are required." @default.
- W2017598128 created "2016-06-24" @default.
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- W2017598128 date "2002-10-15" @default.
- W2017598128 modified "2023-10-16" @default.
- W2017598128 title "Can One Derive the Conformational Preference of a β-Peptide from Its CD Spectrum?" @default.
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- W2017598128 doi "https://doi.org/10.1021/ja020758d" @default.
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