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| Description: Gramicidin A is an antibiotic that acts as an ion pore. Two molecules of gramicidin A form a pore through the membrane by adopting a helical conformation, with their hydrophobic side chains in contact with the lipid. Note the N-termini are inside and the C-termini are outside the bilayer core. The inside of the helix forms the hydrophilic pore. The hydrogen bonding in this open helical structure resembles that in b-sheet polypeptides. This is possible because of the alternating D and L residues. Picture Stats: Views: 107 Filesize: 264.77kB Height: 704 Width: 430 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34339 |