2.6.99.3	wild-type and mutant K43A, to 2.25 and 1.9 A resolution, respectively. Each monomer of DcsD takes a typical fold of type II pyridoxal 5'-phosphate enzymes with the cofactor pyridoxal 5'-phosphate covalently bound to invariant Lys residue (Lys43) at the active site. The pyridine ring of pyridoxal 5'-phoshate makes hydrogen bonds with invariant Asn73 and Ser265 residues. Its phosphate group makes hydrogen bonds with Gly177, Thr178, Thr179 and Thr181 residues	738218