Amino acid sequence comparison of AMYSBS (AB971162) with its closest homologue G. thermoleovorans (4E2O) that has been characterized. Identical amino acids are shown by asterisks below the sequence. The names at left hand side, indicates the organism from which the sequence originated. The active site residues are shown by bold letters. The open and closed circles above the sequence represent the amino acids involved in the binding of metal ions.