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Literature summary extracted from

  • Saito, K.; Rutherford, A.W.; Ishikita, H.
    Mechanism of proton-coupled quinone reduction in photosystem II (2013), Proc. Natl. Acad. Sci. USA, 110, 954-959.
    View publication on PubMedView publication on EuropePMC

Inhibitors

EC Number Inhibitors Comment Organism Structure
1.10.3.9 formate formate ligation to Fe2+ does not significantly affect the protonation of reduced Q, Fe2+ inhibits QBH2 release rather than its formation Thermostichus vulcanus

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
1.10.3.9 Fe2+ nonheme Fe2+ Thermostichus vulcanus

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
1.10.3.9 2 H2O + 2 plastoquinone + 4 hv Thermostichus vulcanus
-
 O2 + 2 plastoquinol
-
 ?

Organism

EC Number Organism UniProt Comment Textmining
1.10.3.9 Thermostichus vulcanus
-
-
-

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.10.3.9 2 H2O + 2 plastoquinone + 4 hv
-
 Thermostichus vulcanus O2 + 2 plastoquinol
-
 ?

Subunits

EC Number Subunits Comment Organism
1.10.3.9 More PSII structure model analysis, H-bond patterns, overview Thermostichus vulcanus

Synonyms

EC Number Synonyms Comment Organism
1.10.3.9 PSII
-
 Thermostichus vulcanus

Cofactor

EC Number Cofactor Comment Organism Structure
1.10.3.9 additional information 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 Thermostichus vulcanus

General Information

EC Number General Information Comment Organism
1.10.3.9 additional information mechanism of proton-coupled quinone reduction in photosystem II, overview. The initial proton transfer to QB.- occurs from the protonated, D1-His252 to QB.- via D1-Ser264. The second proton transfer is likely to occur from D1-His215 to QBH- via an H-bond with an energy profile with a single well, resulting in the formation of QBH2 and the D1-His215 anion. The pathway for reprotonation of D1-His215- may involve bicarbonate, D1-Tyr246 and water in the QB site. Potential-energy profiles of the H-bond donor-acceptor pairs, overview Thermostichus vulcanus
1.10.3.9 physiological function 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 Thermostichus vulcanus