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The reductive half‐reaction of CPR. NADPH binds to oxidized CPR, and a hydride anion is transferred from the reducing nicotinamide coenzyme NADPH to FAD. After FAD hydroquinone formation, electrons are ‘equilibrated’ across the FAD and FMN cofactors to form a quasi‐equilibrium state (‘QE’). With excess NADPH, further reduction occurs, leading to formation of an enzyme species that contains FAD and FMN hydroquinone forms.
