Photosystem I

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Photosynthesis

Reactants and products of PSI

ATP,O2 and NADPH are the products. H2O,NADP,ADP and Pi are the reactants.

Series of Events is PSI

4. Photosystem 1 (PS1) also uses the photons to excite an (e-) from its antenna molecule p700. This electron that is captured by its electron receptor Ferredoxin. Ferredoxin then "hands" the electron to NADP which then adds a H+ from the stroma to form NADPH. 5. Since PS1 lacks the enzyme to split water, the electron from quinone is releases into through the electron transport system or cytochrome shuttle to the thylakoid compartment where it will be used to replace an electron lost by photosystem 1, the hydrogen ions (H+) will also be moved into the thylakoid compartment where it will help establish the hydrogen ion gradient need to produce ATP. 6. Finally, the hydrogen ions (H+) inside the thylakoid pass back to the stroma (3 at a time) supplying the energy to produce ATP via chemiosmosis

Ferrodixin

the last electron acceptor and reduces the enzyme NADP+ reductase. It accepts electrons produced from sunlight-excited chlorophyll and transfers them to the enzyme ferredoxin:

Role of NADP+ reductase in PS1

Catalyzes the transfer of electrons from Fd to NADP+, two electrons are required its reduction to NADPH, whic is at a higher energy level and contains electons that are more avaliable for reactions of the calvin cylce

How PSI and PSII are linked via the z-scheme

electrons pass from P680 to NADP+

Plastocyanin

acts as an electron carrier between the cytochrome b6f and photosystem 1 (PS1) complexes in the photosynthetic electron-transfer chain.

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