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- W2004507316 abstract "The proton nmr and CD spectra of gramicidin S (GS) cyclic-(Val1,1′-Orn2,2′-Leu3,3′-D-Phe4,4′-Pro5,5′)2 and of GS analogs—namely, [D-Ala4,4′]-GS, [Gly4,4′]-GS, and [L-Ala4,4′]-GS—were analyzed. The molecular conformation of [D-Ala4,4′]-GS is similar to that of GS, with the trans form about the D-Ala-Pro peptide bond. The molecular conformation of [Gly4,4′]-GS depends on the solvent composition of dimethylsulfoxide-d6/trifluoroethanol (DMSO)-d6/TFE and DMSO-d6/H2O as well as the solute concentration. In DMSO-d6 solution, [Gly4,4′]-GS forms the GS-type conformation of the monomer at lower concentration. At higher concentration, the GS-type conformer is converted to the other one that forms molecular aggregates. The cis form about the X-Pro peptide bonds is found for [Gly4,4′]-GS and [L-Ala4,4′]-GS in DMSO-d6 and for [L-Ala4,4′]-GS in TFE solution. The large temperature dependences of α-proton chemical shifts of [L-Ala4,4′]-GS in DMSO-d6 solution indicate that the conformer equilibrium changes with temperature. The GS-type conformation is not formed in [L-Ala4,4′]-GS. The two active peptide analogs, [D-Ala4,4′]-GS and [Gly4,4′]-GS, interact with the phospholipid membrane, taking the GS-type conformation. By contrast, an inactive analog, [L-Ala4,4′]-GS, does not interact with phospholipid membrane. The activities of GS analogs are found to correlate to the formation of the GS-type conformation upon binding with phospholipid membrane." @default.
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- W2004507316 date "1986-12-01" @default.
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- W2004507316 title "Gramicidin S analogs with a D-Ala, Gly, or L-Ala residue in place of the D-Phe residue: Molecular conformations and interactions with phospholipid membrane" @default.
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- W2004507316 doi "https://doi.org/10.1002/bip.360251207" @default.
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