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Ferredoxin: NADP + reductase then transfers an electron from each of two ferredoxin molecules to a single molecule of the two electron carrier NADPH. [2] FNR utilizes FAD , which can exist in an oxidized state, single electron reduced semiquinone state, and fully reduced state to mediate this electron transfer.
There are two different pathways of electron transport in PSI. In noncyclic electron transport, ferredoxin carries the electron to the enzyme ferredoxin NADP + reductase (FNR) that reduces NADP + to NADPH. In cyclic electron transport, electrons from ferredoxin are transferred (via plastoquinol) to a proton pump, cytochrome b 6 f. They are then ...
NADP is a reducing agent in anabolic reactions like the Calvin cycle and lipid and nucleic acid syntheses. NADP exists in two forms: NADP+, the oxidized form, and NADPH, the reduced form. NADP is similar to nicotinamide adenine dinucleotide (NAD), but NADP has a phosphate group at the C-2′ position of the adenosyl.
Nicotinamide adenine dinucleotide phosphate, abbreviated NADP [1] [2] or, in older notation, TPN (triphosphopyridine nucleotide), is a cofactor used in anabolic reactions, such as the Calvin cycle and lipid and nucleic acid syntheses, which require NADPH as a reducing agent ('hydrogen source'). NADPH is the reduced form, whereas NADP + is the ...
In non-cyclic photophosphorylation, ferredoxin is the last electron acceptor thus reducing the enzyme NADP + reductase. It accepts electrons produced from sunlight-excited chlorophyll and transfers them to the enzyme ferredoxin: NADP + oxidoreductase EC 1.18.1.2.
Instead, they are transferred to the photosystem I complex, which boosts their energy to a higher level using a second solar photon. The excited electrons are transferred to a series of acceptor molecules, but this time are passed on to an enzyme called ferredoxin-NADP + reductase, which uses them to catalyze the reaction NADP + + 2H + + 2e-→ ...
For example, an enzyme that catalyzed this reaction would be an oxidoreductase: A – + B → A + B –. In this example, A is the reductant (electron donor) and B is the oxidant (electron acceptor).
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD + or NADP + as acceptor. The systematic name of this enzyme class is alcohol:NAD(P) + oxidoreductase. Other names in common use include retinal reductase, aldehyde reductase (NADPH/NADH), and alcohol dehydrogenase [NAD(P)].