Infrared spectra of the Gramicidin A transmembrane channel: the single-stranded-beta 6-helix |
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Authors: | D W Urry R G Shaw T L Trapane K U Prasad |
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Institution: | Laboratory of Molecular Biophysics, University of Alabama in Birmingham, School of Medicine, Birmingham, Alabama 35294 USA |
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Abstract: | IR spectra are reported for preparations of Gramicidin A and malonyl Gramicidin A incorporated as the channel state in phospholipid structures. In this preparation Gramicidin A has already been shown to be unequivocally in the single-stranded beta-helical conformation. The result is an amide I frequency of 1633 +/- 1 cm-1. This demonstrates that the single-stranded beta-helix has an amide I frequency that has previously been considered to be diagnostic of antiparallel double-stranded beta-helix and of beta-sheet structures. |
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