FIGURE 3.

Sequence alignment of MpTsdBA and SlTsdB + TsdA as well as TiTsdB + TsdA. Sequence comparison of TsdBA fusion protein of M. purpuratum (MARPU_02550) with the combined sequence of TsdB and TsdA from S. lithotrophicus (Slit_1877 and Slit_1878) and T. intermedia (Tint_1893 and Tint_2892). All signal peptide sequences were removed. Heme-binding motifs are indicated by gray boxes, and putative distal heme ligands are marked by black edging. Strictly conserved residues are marked with asterisks. TsdA sequences of S. lithotrophicus and T. intermedia start after the gap at amino acids 195 and 189, respectively.