Gramicidin A

This view shows the 2 molecules of Gramicidin A stacked N-terminus to N-terminus (Blue). Chang the the color to "Chain", to see that there are two molecules, colored differently (Blue and Red). Change the color to "CPK", to see that the red oxygens are located down the center of the channel, while the nonpolar side chains point out. Notice from the end view that the channel is relatively narrow.