FIG. 4.

Alignments of the large (α) subunits of class I terminal oxygenase components with the postulated ORF18 and antA gene products. The identical and similar amino acid residues in all proteins are indicated by asterisks and dots, respectively. The gaps introduced into the alignment are indicated by hyphens. The amino acids conserved for the Rieske-type [2Fe-2S] cluster binding site and the mononuclear iron coordination site (28) are indicated by white type and shaded boxes, respectively. The DDBJ, EMBL, and GenBank nucleotide sequence accession numbers are indicated after the names of enzymes and the names of plasmids or bacterial strains (in parentheses).