1.9.6.1	NapD	a small (9.3 kDa) cytoplasmic protein that is essential for Nap activity, role for NapD in the insertion of the molybdenum cofactor. The NapD cysteine residues (C8 and C32) are not conserved and a cysteine-free variant of NapD complements a DELTAnapD strain for restoration of NapA activity. A NapD C8S/C32A variant remains attached to the NapA signal peptide. Copurification of recombinant NapA complexed with N-terminally His-tagged NapD activator by nickel afinity chromatography	742486