ClustalW alignment of the putative carbamate kinase Sll0573 of Synechocystis sp. PCC 6803 and the carbamate kinase ArcC from Pseudomonas aeruginosa. Both proteins share 82% overall similarity (55% identical, 18% strongly similar, 9% weakly similar amino acid residues. * Identical amino acid residues, : similar amino acid residues (A/V/F/P/M/I/L/W, D/E, R/H/K, S/T/Y/H/C/N/G/Q, and • weakly similar amino acid residues. Gaps were introduced into the sequences to maintain an optimal alignment. Two putative transmembrane helices of Sll0573 are boxed (see text for details).