Fig. 6. Overall protein structure of HiNfsB. (A) The two monomer chains of the active dimer are colored in green and cyan. FMN and ligands are bound in the dimer interface and are represented as colored sticks. (B) The interactions of HiNfsB/FMN/1-methyl-5-nitroimidazole (12). Residues from one monomer are colored in blue and those from the other are in light gold. Polar/hydrogen bonding interactions are shown as dash lines. (C) Accessible surface representation of the active site. 12 is shown in the pocket and residues lining the substrate/FMN binding pocket are highlighted in yellow.