Question: The bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diffusion of Na and K ions, thereby killing the cell.

The bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diffusion of Na and K ions, thereby killing the cell. This peptide consists of a sequence of D- and L-amino acids. The sequence of a segment of five amino acids in gramicidin A is R-Gly-L-Ala-D-Leu-L-Ala-D-Val-R¿. Complete the Fischer projection below by adding the correct group to each vertical bond.

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