FIG. 1.

Schematic alignment of YpdF and its homologs in several selected completely sequenced microbial species. Black boxes represent conserved blocks reported by BLOCKS (13) and are numbered I to VII according to their sequential order. Conserved residues involved in metal ion binding are shown at the bottom of the blocks. Lines connecting the boxes are variable segments. Sequences are identified on the left, with the GenBank accession number followed by the species of origin. The sequence on the first line is YpdF of E. coli. The triangles in the N terminus show the start points of N-terminal deletions. The last sequence is the original methionyl aminopeptidase of E. coli. Notice the absence of the extra N-terminal domain in this sequence.