1.10.3.9: photosystem II
This is an abbreviated version!
For detailed information about photosystem II, go to the full flat file.
Word Map on EC 1.10.3.9
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1.10.3.9
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chlorophyll
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chloroplast
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thylakoids
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photochemical
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light-harvesting
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antenna
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photoinhibition
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spinach
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cyanobacterium
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illumination
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synechocystis
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co2
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dissipation
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photoprotection
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photochemistry
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non-photochemical
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qa
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manganese
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epr
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light-induced
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acclimation
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photon
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lhcii
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reinhardtii
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stomatal
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flash
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carotenoid
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extrinsic
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chlamydomonas
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photodamage
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herbicide
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supercomplexes
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synechococcus
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dark-adapted
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elongatus
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zeaxanthin
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singlet
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pigment-protein
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photoautotrophic
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xanthophyl
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photooxidation
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solar
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phytoplankton
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photoinactivation
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excitonic
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atrazine
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photoreduction
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plastocyanin
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far-red
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light-driven
- 1.10.3.9
- chlorophyll
- chloroplast
- thylakoids
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photochemical
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light-harvesting
- antenna
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photoinhibition
- spinach
- cyanobacterium
- illumination
- synechocystis
- co2
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dissipation
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photoprotection
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photochemistry
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non-photochemical
- qa
- manganese
- epr
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light-induced
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acclimation
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photon
- lhcii
- reinhardtii
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stomatal
- flash
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carotenoid
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extrinsic
- chlamydomonas
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photodamage
-
herbicide
-
supercomplexes
- synechococcus
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dark-adapted
- elongatus
- zeaxanthin
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singlet
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pigment-protein
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photoautotrophic
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xanthophyl
- photooxidation
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solar
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phytoplankton
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photoinactivation
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excitonic
- atrazine
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photoreduction
- plastocyanin
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far-red
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light-driven
Reaction
2 H2O + 2 plastoquinone + 4 hnu = + 2 plastoquinol
Synonyms
oxygen-evolving photosystem II, Photosystem II, photosystem II lipoprotein Psb27, photosystem II protein D1 1, photosystem II protein D1 2, PS II, PsbA1, PsbA2, PSII, water:plastoquinone oxido-reductase, water:plastoquinone oxidoreductase
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Substrates Products
Substrates Products on EC 1.10.3.9 - photosystem II
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REACTION DIAGRAM
H2O + 2,5-dimethyl-p-benzoquinone + hv
O2 + 2,5-dimethyl-p-benzoquinol
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H2O + 2,6-dichloro-4-benzoquinone + hv
O2 + 2,6-dichloro-4-benzoquinol
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H2O + 2,6-dichloro-p-benzoquinone + hv
O2 + 2,6-dichloro-p-benzoquinol
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2 H2O + 2 plastoquinone + 4 hv
O2 + 2 plastoquinol
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2,6-dichloro-1,4-benzoquinone and K3Fe(CN)6 as electron acceptors. Oxidation of free quinols by one-electron carriers proceeds rather slowly
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2 H2O + 2 plastoquinone + 4 hv
O2 + 2 plastoquinol
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2 H2O + 2 plastoquinone + 4 hv
O2 + 2 plastoquinol
photosystem II splits water and drives electron transfer to plastoquinone via photochemical reactions using light energy
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2 H2O + 2 plastoquinone + 4 hv
O2 + 2 plastoquinol
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illumination of spinach PSII membranes deprived of intrinsic plastoquinone results in 1O2 formation, singlet oxygen scavenging activity of plastoquinol in photosystem II, significantly suppressed by addition of exogenous plastoquinol to plastoquinone-depleted PSII membranes. Presence of exogenous plastoquinols with a different side-chain length causes a similar extent of 1O2 scavenging activity
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O2 + reduced 2,6-dichlorophenolindophenol
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H2O + 2,6-dichlorophenolindophenol + hv
O2 + reduced 2,6-dichlorophenolindophenol
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H2O + plastoquinone + hv
O2 + plastoquinol
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H2O + plastoquinone + hv
O2 + plastoquinol
Thermosynechococcus vestitus
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H2O + plastoquinone + hv
O2 + plastoquinol
Thermosynechococcus vestitus
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photosystem II catalyzes the light-induced transfer of electrons from water to plastoquinone accompanied by the net transport of protons from the cytoplasm (stroma) to the lumen, the production of molecular oxygen and the release of plastoquinol into the membrane phase
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PS II membrane fragments that contain a membrane pool of PQ and are largely devoid of PS I and Cyt b6f complexes are a convenient object to investigate the process of Cyt b559 photoreduction: biphasic reduction of cytochrome b559 by plastoquinol in photosystem II membrane fragments, two types of cytochrome b559/plastoquinone redox equilibria, detailed overview. In samples of PS II membrane fragments with preoxidized Cyt b559 only a fraction of Cyt b559 (about a half of photoreduced Cyt b559) can be rapidly reduced following a short illumination while the other reduced Cyt b559 is accumulated much slower in the dark. Photoreduction of Cyt b559 in the presence of decylplastoquinone
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additional information
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application of electron acceptors from PSII, 2,6-dimethylbenzoquinone and,2,6-dichlorophenolindophenol, to measure PSII activity
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additional information
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PS II proteins PsbL and PsbJ regulate electron flow to the plastoquinone pool
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additional information
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plastoquinone functions as the primary electron acceptor of photosystem II and beta-carotene does not play a direct role in the primary photochemistry but is required for the C-550 absorbance change
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additional information
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the O2 radical anion is formed via the reduction of molecular oxygen by plastosemiquinones formed through one-electron reduction of plastoquinone at the quinone binding site QB and one-electron oxidation of plastoquinol by Cyt b559 at the QC site
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additional information
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Thermosynechococcus vestitus
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photosystem II has two bound plastoquinones, QA and QB, which act as sequential electron acceptors. QA is tightly bound and acts as a one electron carrier while QB undergoes two sequential one-electron reduction steps
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additional information
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Thermosynechococcus vestitus
photosystem II is a large homdimeric protein-cofactor complex consisting of 20 protein subunits, 35 chlorophyll a molecules and 12 carotenoid molecules, 25 integral lipids and 1 chloride ion per monomer
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