Figure 2. LsdA (Gd_lvs) and Bs levansucrase (Bs_lvs) sequence alignment based on structural superimposition generated by TOP [20].

Secondary-structural elements were assigned using DSSP [48] and are indicated by arrows (β-strands) and squiggles (helices). These elements were labelled following the Bs levansucrase numbering in [9]. A roman numeral (I–V) is assigned to each β-sheet module, and, in each module, the β-strands are numbered with a capital letter (A–D). α- and 3₁₀-helices (labelled α and η respectively) are numbered consecutively. Strictly conserved residues are boxed. The Figure was produced with ESPript [49].