Sequence alignment of SO2426 orthologs from sequenced Shewanella species. ClustalW was used to perform a multiple sequence alignment of Shewanella SO2426 orthologs. The region underlined with "=" is the aligned regulator receiver domain with predicted domain (SO2426: positions 13-124), and the region denoted with "~" is the aligned C-terminal domain containing the wHTH DNA-binding motif (SO2426: positions 158-235). Boldface letters highlighted in grey indicate conserved signature residues of receiver domains. Residue D62 is predicted as 4-aspartylphosphate, the putative phosphorylation site (highlighted in yellow). The star, colon, and dot notations rank the sequence conservation from high to low, respectively. The GenBank accession numbers and associated Shewanella species are provided in the Methods.