Information on EC 1.10.3.9 - photosystem II

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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria

EC NUMBER
COMMENTARY hide
1.10.3.9
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RECOMMENDED NAME
GeneOntology No.
photosystem II
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REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
2 H2O + 2 plastoquinone + 4 hnu = O2 + 2 plastoquinol
show the reaction diagram
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
photosynthesis light reactions
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SYSTEMATIC NAME
IUBMB Comments
H2O:plastoquinone reductase (light-dependent)
Contains chlorophyll a, beta-carotene, pheophytin, plastoquinone, a Mn4Ca cluster, heme and non-heme iron. Four successive photoreactions, resulting in a storage of four positive charges, are required to oxidize two water molecules to one oxygen molecule.
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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Manually annotated by BRENDA team
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Manually annotated by BRENDA team
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Manually annotated by BRENDA team
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Manually annotated by BRENDA team
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Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
malfunction
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PSII is highly sensitive to photoinhibiton in the psbL deletion mutant. The electron flow to plastoquinone in PSII is impaired in the psbJ deletion mutant
physiological function
additional information
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
2 H2O + 2 plastoquinone + 4 hv
O2 + 2 plastoquinol
show the reaction diagram
H2O + 1,4-benzoquinone + hv
O2 + 1,4-benzoquinol
show the reaction diagram
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?
H2O + 2,5-dimethyl-p-benzoquinone + hv
O2 + 2,5-dimethyl-p-benzoquinol
show the reaction diagram
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?
H2O + 2,6-dichloro-4-benzoquinone + hv
O2 + 2,6-dichloro-4-benzoquinol
show the reaction diagram
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?
H2O + 2,6-dichloro-p-benzoquinone + hv
O2 + 2,6-dichloro-p-benzoquinol
show the reaction diagram
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?
H2O + 2,6-dichlorophenolindophenol + hv
O2 + reduced 2,6-dichlorophenolindophenol
show the reaction diagram
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?
H2O + duroquinone + hv
O2 + duroquinol
show the reaction diagram
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?
H2O + ferricyanide + hv
O2 + ferrocyanide
show the reaction diagram
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?
H2O + phenyl-p-benzoquinone + hv
O2 + phenyl-p-benzoquinol
show the reaction diagram
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?
H2O + plastoquinone + hv
O2 + plastoquinol
show the reaction diagram
additional information
?
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NATURAL SUBSTRATES
NATURAL PRODUCTS
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
2 H2O + 2 plastoquinone + 4 hv
O2 + 2 plastoquinol
show the reaction diagram
H2O + plastoquinone + hv
O2 + plastoquinol
show the reaction diagram
COFACTOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
additional information
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photosystem II uses light to drive water oxidation and plastoquinone reduction. Plastoquinone reduction involves two PQ cofactors, QA and QB, working in series. QA is a one-electron carrier, whereas QB undergoes sequential reduction and protonation to form QBH2. QBH2 exchanges with plastoquinone from the pool in the membrane
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METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
INHIBITORS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
3-[3,4-dichlorophenyl]-1,1-dimethylurea
formate
additional information
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light-induced oxidative stress leads to photoinactivation of the oxygen-evolving photosystem II. In contrast to model organisms, photosynthesis persists in Microcoleus sp. even at light intensities 2-3times higher than required to saturate oxygen evolution. This is despite an extensive loss (85-90%) of variable fluorescence and thermoluminescence, representing radiative PSII charge recombination that promotes the generation of damaging singlet oxygen. Light induced loss of variable fluorescence is not inhibited by the electron transfer inhibitors 3-(3,4-dichlorophenyl)-1,1-dimethylurea, 2,5-dibromo-3-methyl-6-isopropylbenzoquinone, nor the uncoupler carbonyl cyanide-p-trifluoromethoxyphenylhydrazone, thus indicating that reduction of plastoquinone or O2, or lumen acidification essential for non-photochemical quenching are not involved
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
additional information
additional information
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
6.5 - 8.3
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assay at
6.5 - 7
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assay at
TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
20
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assay at
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
PDB
SCOP
CATH
ORGANISM
UNIPROT
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
Thermosynechococcus elongatus (strain BP-1)
SUBUNITS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
homodimer
MALDI-TOF mass spectrometry; MALDI-TOF mass spectrometry
multimer
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photosystem II consists of a dimeric photosystem II reaction centre core surrounded by monomeric Lhcb4 (chlorophyll protein 29), Lhcb5 (chlorophyll protein 26) and trimeric light-harvesting complex II antenna proteins
additional information
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PSII structure model analysis, H-bond patterns, overview
Crystallization/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
analysis of the X-ray crystallographic structure of the PSII complexe from Thermosynechococcus elongatus at 2.9 A resolution, PDB entry code 3BZ1
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TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
0
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PSII is inactivated by freezing
Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
Show AA Sequence (6778 entries)
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