Acyclic αγα-tripeptides with fluorinated- and nonfluorinated-furanoid sugar framework: importance of fluoro substituent in reverse-turn induced self-assembly and transmembrane ion-transport activity
Title | Acyclic αγα-tripeptides with fluorinated- and nonfluorinated-furanoid sugar framework: importance of fluoro substituent in reverse-turn induced self-assembly and transmembrane ion-transport activity |
Publication Type | Journal Article |
Year of Publication | 2017 |
Authors | Burade, SS, Shinde, SV, Bhuma, N, Kumbhar, N, Kotmale, A, Rajamohanan, PR, Gonnade, RG, Talukdar, P, Dhavale, DD |
Journal | Journal Of Organic Chemistry |
Volume | 82 |
Start Page | 5826-5834 |
Issue | 11 |
Date Published | JUN |
ISSN | 0022-3263 |
Abstract | Acyclic αγα-tripeptides derived from fluorinated-furanoid sugar amino acid frameworks act as reverse-turn inducers with a U-shaped conformation, whereas the corresponding nonfluorinated αγα-tripeptides show random peptide conformations. The NMR studies showed the presence of bifurcated weak intramolecular hydrogen bonding (F···HN) and N+···Fδ- charge-dipole attraction compel the amide carbonyl groups to orient antiperiplanar to the C-F bond, thus, demonstrating the role of the fluorine substituent in stabilizing the U-shaped conformation. The NOESY data indicate that the U-shaped tripeptides self-assembly formation is stabilized by the intermolecular hydrogen bonding between C=O···HN with antiparallel orientation. This fact is supported by ESI-MS data, which showed mass peaks up to the pentameric self-assembly, even in the gas phase. The morphological analysis by FE-SEM, on solid samples, showed arrangement of fibers into nanorods. The antiparallel self-assembled pore of the fluorinated tripeptides illustrates the selective ion-transport activity. The experimental findings were supported by DFT studies. |
DOI | 10.1021/acs.joc.7b00661 |
Type of Journal (Indian or Foreign) | Foreign |
Impact Factor (IF) | 4.785 |
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