BIOL107 Lecture Notes - Lecture 9: Light-Dependent Reactions, Atp Synthase, Chemiosmosis
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24 Apr 2018
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Electrons are supplied to the reaction centre by the splitting of water. Water splits into 2 electrons, 2 hydrogen ions, and half an oxygen molecule. Pigment molecules absorb the photons and transfer the energy to the special chlorophyll a molecules. (energy transfer called resonance) The special chlorophyll a molecules in the reaction centre are excited. They transfer electrons to the primary electron acceptor pheophytin (which oxidizes the chlorophyll a molecules) Psii, pheophytin, plastiquinone, cytochrome b6-f complex, plastocyanin, ps i. Potential energy of electrons is lost with each transfer. As electrons are passed from plastiquinone to the cytochrome b6-f complex, hydrogen ions are pumped from the stroma across the thylakoid membrane into the thylakoid space (lumen) This creates an electrochemical gradient of hydrogen ions across the membrane called the proton motive force. The hydrogen ions return to the stroma through atp synthase which has one domain in stroma and one in the thylakoid membrane.
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