An organized light-harvesting and reaction-center assembly supporting photosynthetic energy conversion.
An antenna transfers excitation to a reaction centre, where charge separation initiates electron transfer. This distinguishes capture of a photon from conservation of its energy in a redox reaction. In oxygenic photosynthesis, two photosystems act in a connected electron-transfer chain. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 3, 6 and 15, protein function, translation and cell signalling
Photosystem I is a light-driven reaction-centre complex in oxygenic photosynthesis. Excitation supports electron transfer to acceptors including ferredoxin; the balance between linear and cyclic routes affects reductant and ATP supply.
A photosystem involved in water oxidation during oxygenic photosynthesis. Its reaction-center components include D1 protein.
The manganese–calcium-containing catalytic machinery that extracts electrons from water in oxygenic photosynthesis. Four oxidizing equivalents permit formation of one oxygen molecule from two water molecules.
LHCII is a major light-harvesting antenna complex in plants. A regulated mobile fraction participates in photosynthetic state transitions; antenna redistribution is distinct from simply dissipating excitation.
PsbS participates in rapid proton-dependent regulation of photosynthetic antenna quenching in plants. Loss of PsbS-dependent quenching can be separated experimentally from loss of light-harvesting capacity.
Processes replacing damaged photosystem II components and restoring functional complexes. Regulated D1 protein synthesis is one part of this cycle.
A reaction-center protein of photosystem II, encoded by psbA messenger RNA in chloroplast expression systems. Damage creates demand for replacement during photosystem II repair.
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