Figure 8.

Trp cage fold. The 3D structure (PDB: 2JOF) of the 20 amino acid-long Trp cage peptide of the sequence DAYAQWLKDGGPSSGRPPPS was retrieved from the NCBI structure bank and shown in PyMol presentation. The amino- and carboxy-terminal ends are marked as such, and the single α-helix and the β-strand are colored in cyan and magenta, respectively. The central Trp (W6) is red, the Y3–P9 interacting pair is green, and the D9–R16 interacting pair is orange, as detailed in the text (Section 6.3).