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• W2328755890 endingPage "14055" @default.
• W2328755890 startingPage "14045" @default.
• W2328755890 abstract "Quantum mechanical calculations have been used to investigate how the incorporation of an amino group to the Cβ- or Cγ-positions of the pyrrolidine ring affects the intrinsic conformational properties of the proline. Specifically, a conformational study of the N-acetyl-N′-methylamide derivatives of four isomers of aminoproline, which differ not only in the β- or γ-position of the substituent but also in its cis or trans relative disposition, has been performed. To further understand the role of the intramolecular hydrogen bonds between the backbone carbonyl groups and the amino side group, a conformational study was also performed on the corresponding four analogues of (dimethylamino)proline. In addition, the effects of solvation on aminoproline and (dimethylamino)proline dipeptides have been evaluated using a self-consistent reaction field model, and considering four different solvents (carbon tetrachloride, chloroform, methanol and water). Results indicate that the incorporation of the amino substituent into the pyrrolidine ring affects the conformational properties, with backbone···side chain intramolecular hydrogen bonds detected when it is incorporated in a cis relative disposition. In general, the incorporation of the amino side group tends to stabilize those structures where the peptide bond involving the pyrrolidine nitrogen is arranged in cis. The aminoproline isomer with the substituent attached to the Cγ-position with a cis relative disposition is the most stable in the gas phase and in chloroform, methanol and water solutions. Replacement of the amino side group by the dimethylamino substituent produces significant changes in the potential energy surfaces of the four investigated (dimethylamino)proline-containing dipeptides. Thus, these changes affect not only the number of minima, which increases considerably, but also the backbone and pseudorotational preferences. In spite of these effects, comparison of the conformational preferences, i.e., the more favored conformers, calculated for different isomers of aminoproline and (dimethylamino)proline dipeptides showed a high degree of consistency for the two families of compounds." @default.
• W2328755890 created "2016-06-24" @default.
• W2328755890 creator A5025357844 @default.
• W2328755890 creator A5033713946 @default.
• W2328755890 creator A5075694477 @default.
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• W2328755890 date "2008-10-09" @default.
• W2328755890 modified "2023-09-27" @default.
• W2328755890 title "Conformational Preferences of β- and γ-Aminated Proline Analogues" @default.
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• W2328755890 doi "https://doi.org/10.1021/jp807638p" @default.
• W2328755890 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2836598" @default.
• W2328755890 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18842022" @default.
• W2328755890 hasPublicationYear "2008" @default.
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