Structure of proline dehydrogenase (proline
oxidase) from Thermus thermophilus. The flavine
adenine dinucleotide at the active site is shown in yellow. The
flexible alpha helix adjacent to the FAD is shown in violet and
blue. Access of the FAD to solvent O2 allows direct
reduction of O2 to form superoxide radicals. The figure
is used with permission from Dr. Jack Tanner, University of
Missouri-Columbia, and the Journal of Biological Chemistry.
