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  2. Nicotinamide adenine dinucleotide - Wikipedia

    en.wikipedia.org/wiki/Nicotinamide_adenine_di...

    In cellular metabolism, NAD is involved in redox reactions, carrying electrons from one reaction to another, so it is found in two forms: NAD + is an oxidizing agent, accepting electrons from other molecules and becoming reduced; with H +, this reaction forms NADH, which can be used as a reducing agent to donate electrons. These electron ...

  3. Dehydrogenase - Wikipedia

    en.wikipedia.org/wiki/Dehydrogenase

    Reaction catalyzed by an oxidase, note the reduction of oxygen as the electron acceptor. Dehydrogenase and oxidase are easily distinguishable if one considers the electron acceptor. An oxidase will remove electrons from a substrate as well, but only uses oxygen as its electron acceptor. One such reaction is: AH 2 + O 2 ↔ A + H 2 O 2.

  4. Glycerol-3-phosphate dehydrogenase - Wikipedia

    en.wikipedia.org/wiki/Glycerol-3-phosphate_de...

    The NAD+/NADH coenzyme couple act as an electron reservoir for metabolic redox reactions, carrying electrons from one reaction to another. [5] Most of these metabolism reactions occur in the mitochondria. To regenerate NAD+ for further use, NADH pools in the cytosol must be reoxidized.

  5. Ferredoxin—NADP(+) reductase - Wikipedia

    en.wikipedia.org/wiki/Ferredoxin—NADP(+)_reductase

    Ferredoxin: NADP + reductase is the last enzyme in the transfer of electrons during photosynthesis from photosystem I to NADPH. [2] The NADPH is then used as a reducing equivalent in the reactions of the Calvin cycle. [2] Electron cycling from ferredoxin to NADPH only occurs in the light in part because FNR activity is inhibited in the dark. [11]

  6. Electron transport chain - Wikipedia

    en.wikipedia.org/wiki/Electron_transport_chain

    The flow of electrons through the electron transport chain is an exergonic process. The energy from the redox reactions creates an electrochemical proton gradient that drives the synthesis of adenosine triphosphate (ATP). In aerobic respiration, the flow of electrons terminates with molecular oxygen as the final electron

  7. Respiratory complex I - Wikipedia

    en.wikipedia.org/wiki/Respiratory_complex_I

    The energy from the redox reaction results in conformational change allowing hydrogen ions to pass through four transmembrane helix channels. Respiratory complex I , EC 7.1.1.2 (also known as NADH:ubiquinone oxidoreductase , Type I NADH dehydrogenase and mitochondrial complex I ) is the first large protein complex of the respiratory chains of ...

  8. Light-dependent reactions - Wikipedia

    en.wikipedia.org/wiki/Light-dependent_reactions

    The light-harvesting system of PSI uses multiple copies of the same transmembrane proteins used by PSII. The energy of absorbed light (in the form of delocalized, high-energy electrons) is funneled into the reaction center, where it excites special chlorophyll molecules (P700, with maximum light absorption at 700 nm) to a higher energy level.

  9. NAD+ glycohydrolase - Wikipedia

    en.wikipedia.org/wiki/NAD+_glycohydrolase

    In enzymology, a NAD + glycohydrolase (EC 3.2.2.5) is an enzyme that catalyzes the chemical reaction. NAD + + H 2 O ADP-ribose + nicotinamide. Thus, the two substrates of this enzyme are NAD + and H 2 O, whereas its two products are ADP-ribose and nicotinamide.