FIG. 1.

Amino acid sequence alignment of NorB. The N. gonorrhoeae NorB (Ngo) predicted amino acid sequence is compared to the R. eutropha NorB (ReB; nucleotide sequence accession no. AF002217), the R. eutropha NorZ (ReZ; nucleotide sequence accession no. AF002661), and the Synechocystis sp. strain PCC6803 NorB (Ssp; nucleotide sequence accession no. D90917). Identical residues are shaded in gray, and conserved His residues are indicated by asterisks. Sequence alignment was performed using CLUSTAL W (http://www2.ebi.ac.uk/clustalw/).