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  2. Photophosphorylation - Wikipedia

    en.wikipedia.org/wiki/Photophosphorylation

    The other pathway, non-cyclic photophosphorylation, is a two-stage process involving two different chlorophyll photosystems in the thylakoid membrane. First, a photon is absorbed by chlorophyll pigments surrounding the reaction core center of photosystem II.

  3. Light-dependent reactions - Wikipedia

    en.wikipedia.org/wiki/Light-dependent_reactions

    Cytochrome b 6 f and ATP synthase work together to produce ATP (photophosphorylation) in two distinct ways. In non-cyclic photophosphorylation, cytochrome b 6 f uses electrons from PSII and energy from PSI [citation needed] to pump protons from the stroma to the lumen. The resulting proton gradient across the thylakoid membrane creates a proton ...

  4. Photosystem - Wikipedia

    en.wikipedia.org/wiki/Photosystem

    If electrons only pass through once, the process is termed noncyclic photophosphorylation, but if they pass through PSI and the proton pump multiple times it is called cyclic photophosphorylation. When the electron reaches photosystem I, it fills the electron deficit of light-excited reaction-center chlorophyll P700 + of PSI.

  5. Thylakoid - Wikipedia

    en.wikipedia.org/wiki/Thylakoid

    Cyclic electron transport or cyclic photophosphorylation produces only ATP. The noncyclic variety involves the participation of both photosystems, while the cyclic electron flow is dependent on only photosystem I. Photosystem I uses light energy to reduce NADP + to NADPH + H +, and is active in both noncyclic and cyclic electron transport. In ...

  6. Hill reaction - Wikipedia

    en.wikipedia.org/wiki/Hill_reaction

    Noncyclic photophosphorylation through light-dependent reactions of photosynthesis at the thylakoid membrane. Photosynthesis is the process in which light energy is absorbed and converted to chemical energy. This chemical energy is eventually used in the conversion of carbon dioxide to sugar in plants.

  7. Ferredoxin - Wikipedia

    en.wikipedia.org/wiki/Ferredoxin

    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 .

  8. Cytochrome b6f complex - Wikipedia

    en.wikipedia.org/wiki/Cytochrome_b6f_complex

    The cytochrome b 6 f complex is a dimer, with each monomer composed of eight subunits. [3] These consist of four large subunits: a 32 kDa cytochrome f with a c-type cytochrome, a 25 kDa cytochrome b 6 with a low- and high-potential heme group, a 19 kDa Rieske iron-sulfur protein containing a [2Fe-2S] cluster, and a 17 kDa subunit IV; along with four small subunits (3-4 kDa): PetG, PetL, PetM ...

  9. Electrochemical gradient - Wikipedia

    en.wikipedia.org/wiki/Electrochemical_gradient

    The proton gradient can be generated through either noncyclic or cyclic photophosphorylation. Of the proteins that participate in noncyclic photophosphorylation, photosystem II (PSII), plastiquinone, and cytochrome b 6 f complex directly contribute to generating the proton gradient. For each four photons absorbed by PSII, eight protons are ...