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A process, occurring as part of photosynthesis, whereby light provides the energy for a series of electron carriers to operate together to transfer electrons and generate a transmembrane electrochemical gradient. The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide (CO2) using energy obtained from light rather than from the oxidation of chemical compounds. The mechanism by which high light intensity inhibits photosynthesis through inactivation of the D1 protein of photosystem II. Electrons move from the primary electron acceptor (Quinone, X) through a chain of electron transport molecules in the thylakoid membrane until they reach ferredoxin which passes the electron to the ultimate electron acceptor; NADP. null null null Electrons move from the primary electron acceptor (Quinone, Q) through a chain of electron transport molecules in the thylakoid membrane until they reach the ultimate electron acceptor of Photosystem II, which is plastocyanin (PC). The electron is then passed to the P700 chlorophyll a molecules of the reaction centre of photosystem I. The chemical reactions and pathways resulting in the formation of precursor metabolites, substances from which energy is derived, and any process involved in the liberation of energy from these substances. The light reactions of photosynthesis, which take place in photosystems II and I. Light energy is harvested and used to power the transfer of electrons among a series of electron donors and acceptors. The final electron acceptor is NADP+, which is reduced to NADPH. NADPH generated from light reactions is used in sugar synthesis in dark reactions. Light reactions also generate a proton motive force across the thylakoid membrane, and the proton gradient is used to synthesize ATP. There are two chemical reactions involved in the light reactions: water oxidation in photosystem II, and NADP reduction in photosystem I. A process whereby a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient. The process of removal or addition of one or more electrons with or without the concomitant removal or addition of a proton or protons.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: photosynthetic electron transport chain
Acc: GO:0009767
Aspect: Biological Process
Desc: A process, occurring as part of photosynthesis, whereby light provides the energy for a series of electron carriers to operate together to transfer electrons and generate a transmembrane electrochemical gradient.
Synonyms:
  • electron carrier, chlorophyll electron transport system
Proteins in PDR annotated with:
   This term: 4 [Search]
   Term or descendants: 34 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0009767 - photosynthetic electron transport chain (interactive image map)
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