Fig. 1.

Sequence of peptide D-V13K_D (top) and representation as a helical net (left) and helical wheel (right). In the helical net, non-polar residues making up the non-polar face of the amphipathic peptide are circled. In the helical wheel, the non-polar face of the amphipathic peptide is indicated by an open arc, whilst the polar face is indicated by a solid arc. The lysine residue at position 13 of the sequence is denoted by a triangle on the non-polar face of both representations. Ac denotes N^α-acetyl and amide denotes C^α-amide. One-letter codes are used for the amino acid residues.