(A) Carbons in residues in the CoQ-binding pocket are colored according
to residue type: nonpolar, white; negatively charged, magenta; positively
charged, orange; polar, blue; carbons in DCQ are colored green. Hydrogen bonds
are indicated by dashed yellow lines.
(B) The arrow shows the single through-space jump from FAD:O2 to DCQ:C3M
predicted by the program HARLEM. Trp435:NH1, Ser378:O, and a water molecule are
proposed to act as proton donors or acceptors, as discussed in the text.
See also Figures 2A and 2B.