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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.
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 ...
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.
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 ...
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.
Oxidoreductases, enzymes that catalyze oxidation-reduction reactions, constitute Class EC 1 of the IUBMB classification of enzyme-catalyzed reactions. [2] Any of these may be called dehydrogenases, especially those in which NAD + is the electron acceptor (oxidant), but reductase is also used when the physiological emphasis on reduction of the substrate, and oxidase is used only when O 2 is the ...
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).
Fd moves to carry an electron either to a lone thylakoid or to an enzyme that reduces NADP +. [19] Thylakoid membranes have one binding site for each function of Fd. [19] The main function of Fd is to carry an electron from the iron-sulfur complex to the enzyme ferredoxin– NADP + reductase. [19]