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Comparison of wild-type QFR and SdhB H207T mutant enzymes near their quinone-binding site. Wild-type QFR (Protein Data Bank code 1KF6) is shown in pink, and the SdhB H207T mutant is shown in cyan. 2-n-Heptyl-4-hydroxyquinoline-N-oxide (HQNO) in pink is shown at the site where menaquinone binds in QFR, and carboxin (CBE) is shown at the ubiquinone-binding site in SQR.
