CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
2 | Mainly Beta |
|
2.102 | 3-layer Sandwich |
|
2.102.10 | Rieske Iron-sulfur Protein |
|
2.102.10.10 | Rieske [2Fe-2S] iron-sulphur domain |
Domain Context
CATH Clusters
| Superfamily | Rieske [2Fe-2S] iron-sulphur domain |
| Functional Family | Cytochrome b6-f complex iron-sulfur subunit |
Enzyme Information
| 7.1.1.6 |
Plastoquinol--plastocyanin reductase.
based on mapping to UniProt Q93SX0
Plastoquinol + 2 oxidized plastocyanin + 2 H(+)(Side 1) = plastoquinone + 2 reduced plastocyanin + 4 H(+)(Side 2).
-!- Contains two b-type cytochromes, two c-type cytochromes (c(n) and f), and a [2Fe-2S] Rieske cluster. -!- The enzyme plays a key role in photosynthesis, transferring electrons from photosystem II (EC 1.10.3.9) to photosystem I (EC 1.97.1.12). -!- Cytochrome c-552 can act as acceptor instead of plastocyanin, but more slowly. -!- In chloroplasts, protons are translocated through the thylakoid membrane from the lumen to the stroma. -!- The mechanism occurs through the Q cycle as in EC 7.1.1.8 (complex III) and involves electron bifurcation. -!- Formerly EC 1.10.9.1 and EC 1.10.99.1.
|
UniProtKB Entries (1)
| P0A384 |
CYB6_NOSS1
Nostoc sp. PCC 7120
Cytochrome b6
|
PDB Structure
| PDB | 4H44 |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | |
| Primary Citation |
Quinone-dependent proton transfer pathways in the photosynthetic cytochrome b6f complex
Proc.Natl.Acad.Sci.USA
|
