Fig. 6.

Cylindrical surface lattice of α-helix CD1 for wild-type protein, after Kanto et al.¹⁵ Here, the amino acids are represented by 5-Å squares, labeled appropriately. The diagram may be cut out and rolled into a cylinder of diameter 11 Å, ready to engage with neighboring α-helices with center–center spacing of 11 Å: note that, for this purpose, some squares are shown repeating on the edges. Residues forming the hydrophobic stripe, which connects with ND1a to make a classical left-handed supercoil, are colored orange. Six single-amino-acid substitutions that cause the flagellin to construct different helical forms have been marked.