Figure 22.13 The structure of NADP⁺. Nicotinamide adenine dinucleotide phosphate (NADP⁺) is a prominent carrier of high-energy electrons. NADP⁺ binds a hydride ion (H⁻) at the reactive site to form NADPH in a reaction entirely analogous to the reduction of NAD⁺ (Figure 15.12).