Figure 5.

Multiple sequence alignments of ASP1 homologues from 8 representative actinobacterial species. Conserved residues are colored based on the complete alignment of all 43 available actinobacterial homologues (see Additional file 3): purple, absolutely conserved residues; yellow, highly conserved residues. β strands and α helices are labeled in red and blue, corresponding to the ribbon diagram in Figure 2.