FIG. 3.

Comparison of two PhoU domains of PHOU_AQUAE. (A) Amino acid sequence alignment of two PhoU domains in PHOU_AQUAE. The residues colored red are identical in the two PhoU domains of PHOU_AQUAE. The green residues have similar properties. Colored regions above and below the sequences denote corresponding α-helices. (B) Superimposition of the two PhoU domains of PHOU_AQUAE. The matrix for superimposition was calculated by DALI (15) when a search was done using a pairwise comparison of the domains. The dark-orange color corresponds to domain 1 (residues 1 to 114), and the gold color corresponds to domain 2 (residues 117 to 214). The regions of Cα trace colored in seagreen correspond to identical residues. This illustration was prepared using Molscript (18).