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fmnh 2 + nad(p)+ fmn + nad(p)h + h + The 3 substrates of this enzyme are FMNH2 , NAD + , and NADP + , whereas its 4 products are FMN , NADH , NADPH , and H + . This enzyme belongs to the family of oxidoreductases , specifically those acting on the CH-NH group of donors with NAD+ or NADP+ as acceptor.
In enzymology, a ferredoxin-NADP + reductase (EC 1.18.1.2) abbreviated FNR, is an enzyme that catalyzes the chemical reaction. 2 reduced ferredoxin + NADP + + H + 2 oxidized ferredoxin + NADPH. The 3 substrates of this enzyme are reduced ferredoxin, NADP +, and H +, whereas its two products are oxidized ferredoxin and NADPH.
FMN reductase (NAD(P)H) (EC 1.5.1.39, FRG) is an enzyme with systematic name FMNH 2:NAD(P) + oxidoreductase. [1] This enzyme catalyses the following chemical reaction.
Flavin mononucleotide (FMN), or riboflavin-5′-phosphate, is a biomolecule produced from riboflavin (vitamin B 2) by the enzyme riboflavin kinase and functions as the prosthetic group of various oxidoreductases, including NADH dehydrogenase, as well as a cofactor in biological blue-light photo receptors. [1]
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]
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The then-reduced PSI, absorbs another photon producing a more highly reducing electron, which converts NADP + to NADPH. In oxygenic photosynthesis, the first electron donor is water, creating oxygen (O 2) as a by-product. In anoxygenic photosynthesis, various electron donors are used.
Unlike non-cyclic photophosphorylation, NADP + does not accept the electrons; they are instead sent back to the cytochrome b 6 f complex. [citation needed] In bacterial photosynthesis, a single photosystem is used, and therefore is involved in cyclic photophosphorylation.