Fig. 4.

Segments of φRIO-1, T7, epsilon15, and P22 proteins exhibiting significant sequence similarity in the homologs of tubular tail B. The proteins φRIO-1 gp40 plus gp44, T7 gp12, epsilon15 gp12, and P22 gp10 are shown with predicted secondary structural elements as follows: blue—predicted beta strand; red—predicted alpha helix. A vertical line shows the point of fusion of gp44 and gp40 in φRIO-1. The central box encompassing all four sequences is the region of significant alignment as reported by HHPRED’s local alignment option. The coordinates in T7 gp12 are 354–556. Some additional regions of significant similarity between T7 and epsilon15 gp12 are also indicated.