Figure 6.

Structurally based amino acid alignment within the β-helix main body of the tailspike protein. Each row corresponds to a β-helix turn (1 to 13) and each column to a ladder of aligned residues, pointing either into the interior of the β-helix (i) or to the outside (a). Dots indicate insertion or deletions into the β-helix. The sheets termed A (blue), B (yellow) and C (green) (Steinbacher et al., 1994) correspond to the sheets PB2, PB3 and PB1 in pectate lyase C from Ewinia chrysanthemi(Yoder et al., 1993). Only short repetitive elements of identical amino acids are present.