Multiple sequence alignment of SMU.636 homologues. The sequences of the glucosamine 6-phosphate deaminases of known structure from B. subtilis (Vincent et al., 2005 ▶), E. coli (Oliva et al., 1995 ▶) and human (Arreola et al., 2003 ▶) are aligned with SMU.636. The conserved residues composing the active centre are indicated by grey boxes and the percentage sequence identities with SMU.636 are indicated after the organism names; asterisks indicate totally conserved residues. The alignment was performed using the program CLUSTALX (Thompson et al., 1997 ▶). BSUB, B. subtilis; ECOL, E. coli; HSAP, Homo sapiens.