KEGG   ENZYME: 1.10.3.9Help
Entry
EC 1.10.3.9                 Enzyme                                 

Name
photosystem II
Class
Oxidoreductases;
Acting on diphenols and related substances as donors;
With oxygen as acceptor
BRITE hierarchy
Sysname
H2O:plastoquinone reductase (light-dependent)
Reaction(IUBMB)
2 H2O + 2 plastoquinone + 4 hnu = O2 + 2 plastoquinol [RN:R09503]
Reaction(KEGG)
Substrate
H2O [CPD:C00001];
plastoquinone [CPD:C02061];
hnu [CPD:C00205]
Product
O2 [CPD:C00007];
plastoquinol [CPD:C16693]
Comment
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.
History
EC 1.10.3.9 created 2011
Reference
1  [PMID:849432]
  Authors
Knaff DB, Malkin R, Myron JC, Stoller M
  Title
The role of plastoquinone and beta-carotene in the primary reaction of plant photosystem II.
  Journal
Biochim. Biophys. Acta. 459 (1977) 402-11.
Reference
2  [PMID:19219048]
  Authors
Guskov A, Kern J, Gabdulkhakov A, Broser M, Zouni A, Saenger W
  Title
Cyanobacterial photosystem II at 2.9-A resolution and the role of quinones, lipids, channels and chloride.
  Journal
Nat. Struct. Mol. Biol. 16 (2009) 334-42.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 

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