Fig. 2: S. Islandicus REY15A mono-pilin versus tri-pilins.
From: Two distinct archaeal type IV pili structures formed by proteins with identical sequence
Atomic model of mono-pilin a and tri-pilin A b in cartoon representation with β-sheets colored blue and α-helices colored red. The map quality of the N-terminal long helix and C-terminal Ig-like domain are shown on the right. c Alignment of the three pilins of the tri-pilus asymmetric unit (A, cyan; B, red; C, yellow) and the single pilin of the mono-pilus asymmetric unit (purple) by their N-terminal helices is shown. The angles and axes of rotation between each of the tri-pilin C-terminal Ig-like domains and the mono-pilin Ig-like domain are labeled.
