Author: Milada Teplá. Faculty of Science, Charles University, www.studiumbiochemie.cz/photosynthesis.html.

Photons in photosystem I (PS I) are absorbed by chlorophyll molecules with an absorption maximum at 700 nm (P700). Released energy is used for excitation of an electron. The excited electron is transferred from the photosystem I acceptor to ferredoxin (Fd). The oxidized chlorophyll molecule receives an electron from plastocyanin (pC). Plastocyanin takes an electron from cytochrome b6-f complex and returns to reduced state. The electron is transferred from ferredoxin to NADP-reductase, which uses two electrons and a proton to reduce the coenzyme NADP+ to NADPH.

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