Sequence alignment of PH1704 homologs. Abbreviations are: Pho,
P. horikoshii; Pfu, P. furiosus (NCBI
access ID, Q51732; percentage identity, 90%); Ape, Aeopyrum
pernix (BAA79274.1, 61%); Afu, Archaeoglobus
fulgidus (2649300, 53%); Eco, E. coli (P45470,
47%); Bsu, Bacillus subtilis (BAA23403, 43%); Sau,
Staphylococcus aureus (Q53719, 39%); Aae,
Aquifex aeolicus (2983230, 42%). Secondary structure
analysis is based on the crystal structure of PH1704. “H” and
“S” refer to helix and strand, respectively.