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The conformation of the 1:1 complex of [Val 1 ] gramicidin A with caesium cations has been determined in methanol/chloroform (1:1) solution by 2-dimensional 1 H-NMR spectroscopy. The molecular structure was found to be a right-handed antiparallel double helical dimer ↑↓ππ LD7.2 with 7.2 residues per turn, which incorporates two caesium cations.
The conformation of species 3 of Val-gramicidin A in dioxane has been determined by two-dimensional NMR spectroscopy. It is presented by the left handed ππ 5.6LD double helix, a suitable model of an ion permeable pore across the membrane matrix.
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