Inhibitors | Comment | Organism | Structure |
---|---|---|---|
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 | Comment | Organism | Structure |
---|---|---|---|
Fe2+ | nonheme Fe2+ | Thermostichus vulcanus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
2 H2O + 2 plastoquinone + 4 hv | Thermostichus vulcanus | - |
O2 + 2 plastoquinol | - |
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Organism | UniProt | Comment | Textmining |
---|---|---|---|
Thermostichus vulcanus | - |
- |
- |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
2 H2O + 2 plastoquinone + 4 hv | - |
Thermostichus vulcanus | O2 + 2 plastoquinol | - |
? |
Subunits | Comment | Organism |
---|---|---|
More | PSII structure model analysis, H-bond patterns, overview | Thermostichus vulcanus |
Synonyms | Comment | Organism |
---|---|---|
PSII | - |
Thermostichus vulcanus |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
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 | Comment | Organism |
---|---|---|
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 |
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 |