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Ubiquinone binding of RegB studied by isothermal titration calorimetry. (A) Isothermal titration calorimetry of RegB C265S with oxidized ubiquinone. RegB C265S (13 µM) was titrated with 11 consecutive injections of 25 µl 2.5 mM coenzyme Q0 in the presence of 2.5 mM K3Fe(CN)6. (B) Isothermal titration calorimetry of RegB C265S with reduced ubiquinone. RegB C265S (13 µM) was titrated with 11 consecutive injections of 25 µl 2.5 mM coenzyme Q0 in the presence of 5 mM dithionite.
