Structural comparison of the C -terminal module of both Tm FADS (pdb 1t6y) and the homology model of At RibF1. A) Ribbon diagrams of TmFADS (gray) and homology model of AtRibF1 (green). Bound ADP and FMN ligands in pdb 1t6y are shown as sticks in CPK with carbons in magenta. Conserved residues in the C-terminus of plant-like FADS are superposed to catalytic residues in TmFADS. Electrostatic potential surface of AtRibF1 is also shown. B) Putative new active site in the structural model of AtRibF1. Specific-plant conserved residues are shown as sticks with carbons in green.