Alignment prepared by CLUSTALW (Thompson et al., 1994 ▶), AMAS (Livingstone & Barton, 1993 ▶) and ALSCRIPT (Barton, 1993 ▶). Identical and conserved regions are marked in red and green, respectively (see definition in text). The secondary structure of 1xm5 was assigned using DSSP (Kabsch & Sander, 1983 ▶) and is indicated below each block. Cylinders stands for α-helix and arrows for β-strand. Metal-binding residues are indicated by black arrows. The species for each sequence is listed following their accession ID: 1XM5 (ybeY), Escherichia coli; ZP_00092890.1, Azotobacter vinelandii; ZP_00205591, Pseudomonas syringae; YP_151278.1, Salmonella enterica; AAL19619.1, Salmonella typhimurium; YP_049423.1, Erwinia carotovora; Q7N748, Photorhabdus luminescens; CAH20351.1, Yersinia pseudotuberculosis; YP_131025.1, Photobacterium profundum; Q9JRS8, Actinobacillus actinomycetemcomitans; P57517, Buchnera aphidicola; Q8K9C1, Buchnera aphidicola; YP_113914.1, Methylococcus capsulatus; NP_879826.1, Bordetella pertussis; 1OZ9 (AQ_1354), Aquifex aeolicus.