FIGURE 6.

Sequence alignment of Csd6 homologs. Sequence alignment of Csd6 homologs from H. pylori strain 26695 (HP0518; Swiss-Prot accession code O25255), from Wolinella succinogenes (Q7MRJ6), from Arcobacter nitrofigilis (D5V196), from Campylobacter concisus strain 13826 (A7ZCK9), and from Thermovibrio ammonificans (E8T4Z0) was performed and presented by ClustalX (78) and ESPript (79). The secondary structure of Csd6 is presented above the aligned sequences. The four loops I–IV around the active site of the Csd6 l,d-CPase domain are indicated with boxes colored as in Fig. 4E.