Multiple sequence alignment of B. borstelensis BCS-1 BDA and other related proteins. Highly conserved residues are in black (100% identity), and less strongly conserved residues are in gray (90% identity). Proteins: BDA, d-stereospecific alanine amidase from B. borstelensis BCS-1 (GenBank accession number AF441121); Bs-ZnDAP, Zn-dependent d-aminopeptidase DppA from B. subtilis (GenBank accession number 15825746); Bs-dciAA, dipeptide transport system from B. subtilis (GenBank accession number CAA40002); Bm-DPPA, dipeptide transport protein from Bacillus methanolicus (GenBank accession number AAB39857); Lin-ABC, dipeptide ABC transporter from Listeria innocua (GenBank accession number NP469546); Mloti-ABC, dipeptide ABC transporter from M. loti (GenBank accession number BAB52911); Drad-ABC, putative dipeptide ABC transporter from Deinococcus radiodurans (GenBank accession number NP295566); Sco-PTP, putative transport-associated protein from Streptomyces coelicolor A3 (GenBank accession number CAA22734); Pho-DPPA, hypothetical dipeptide transport protein dppA from Pyrococcus horikoshii (GenBank accession number BAA30694).