FIG. 2.

Alignment of Ppk from Acinetobacter sp. strain ADP1 (Ac; this work) with the putative Ppk proteins from N. meningitidis (Nm; GenBank accession no. U16262), Synechocystis sp. (Ss; GenBank accession no. D64005), M. tuberculosis (Mt; GenBank accession no. Z83018), Campylobacter coli (Cc; EMBL accession no. Y07620), and Helicobacter pylori (Hp; GenBank accession no. AE000609) and with the biochemically characterized Ppk from E. coli (Ec) (3). Amino acids are given in a one-letter code. White letters indicate that at least five of the seven compared residues were identical. Two histidine residues functionally important in E. coli Ppk are marked with asterisks (His442 and His461 in the Acinetobacter sequence).