_EC 1.10.9.1 Plastoquinol--plastocyanin reductase. 13 PDB entries  
EC 1.-.-.- Oxidoreductases. [8,127 PDB entries]
EC 1.10.-.- Acting on diphenols and related substances as donors. [193 PDB entries]
EC 1.10.9.- With a copper protein as acceptor. [13 PDB entries]
EC 1.10.9.1 Plastoquinol--plastocyanin reductase. [13 PDB entries]    
1q90

Reaction: Plastoquinol + 2 oxidized plastocyanin + 2 H(+)(Side 1) = plastoquinone + 2 reduced plastocyanin + 2 H(+)(Side 2).
 


Plastoquinol
+ 2 × oxidized plastocyanin
+ 2 × H(+)(Side 1)
=
plastoquinone
+ 2 × reduced plastocyanin
+ 2 × H(+)(Side 2)
Molecule diagrams generated from .mol files obtained from the KEGG ftp site.

Other name(s): Cytochrome b6f complex.
Comments: Contains two b-type cytochromes, two c-type cytochromes (cn and f), and a [2Fe-2S] Rieske cluster. 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. Formerly Ec 1.10.99.1.
Links:   [IntEnz]   [ExPASy]   [KEGG]  

There are 13 PDB entries in enzyme class E.C.1.10.9.1

  PDB code Protein
1q90
Structure of the cytochrome b6f (plastohydroquinone : plasto oxidoreductase) from chlamydomonas reinhardtii
Source: Chlamydomonas reinhardtii. Organism_taxid: 3055. Strain: h6f5. Atcc: chloroplast gene. Collection: chloroplast gene. Organelle: chloroplast. Gene: peta. Expressed in: chlamydomonas reinhardtii. Expression_system_taxid: 3055.
Chains: C, R (126 residues) CATH domain: 2.102.10.10
Bound ligand:   Het Group TDS is 40.62% similar to enzyme reactant Plastoquinol
1rfs
Rieske soluble fragment from spinach
Source: Spinacia oleracea. Spinach. Organism_taxid: 3562. Tissue: leaf. Organelle: chloroplast
Chain: A (127 residues) CATH domain: 2.102.10.10
1vf5
Crystal structure of cytochrome b6f complex from m.Laminosus
Source: Mastigocladus laminosus. Organism_taxid: 83541. Other_details: thermophilic cyanobacterium. Other_details: thermophilic cyanobacterium
Chains: D, Q (168 residues) CATH domains: 1.20.5.700 2.102.10.10
Bound ligand:   Het Group PL9 is 45.00% similar to enzyme reactant Plastoquinol
2d2c
Crystal structure of cytochrome b6f complex with dbmib from laminosus
Source: Mastigocladus laminosus. Organism_taxid: 83541. Organism_taxid: 83541
Chains: D, Q (168 residues) CATH domains: 1.20.5.700 2.102.10.10
Bound ligand:   Het Group BNT is 61.11% similar to enzyme reactant Plastoquinol
2e74
Crystal structure of the cytochrome b6f complex from m.Lamin
Source: Mastigocladus laminosus. Organism_taxid: 83541. Organism_taxid: 83541
Chain: D (166 residues) CATH domains: Unassigned 2.102.10.10
Bound ligand:   Het Group HEM is 47.83% similar to enzyme reactant Plastoquinol
2e75
Crystal structure of the cytochrome b6f complex with 2-nonyl hydroxyquinoline n-oxide (nqno) from m.Laminosus
Source: Mastigocladus laminosus. Organism_taxid: 83541. Organism_taxid: 83541
Chain: D (166 residues) CATH domains: Unassigned 2.102.10.10
Bound ligand:   Het Group HEM is 47.83% similar to enzyme reactant Plastoquinol
2e76
Crystal structure of the cytochrome b6f complex with tridecy stigmatellin (tds) from m.Laminosus
Source: Mastigocladus laminosus. Organism_taxid: 83541. Organism_taxid: 83541
Chain: D (168 residues) CATH domains: Unassigned 2.102.10.10
Bound ligand:   Het Group HEM is 47.83% similar to enzyme reactant Plastoquinol
2zt9
Crystal structure of the cytochrome b6f complex from nostoc 7120
Source: Nostoc sp. Pcc 7120. Organism_taxid: 103690. Organism_taxid: 103690
Chain: D (166 residues) CATH domains: Unassigned 2.102.10.10
3azc
Crystal structure of the soluble part of cytochrome b6f comp sulfur subunit from thermosynechococcus elongatus bp-1
Source: Thermosynechococcus elongatus. Organism_taxid: 197221. Strain: bp-1. Gene: petc, tlr0959. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chain: A (133 residues) CATH domain: 2.102.10.10
4h0l
Cytochrome b6f complex crystal structure from mastigocladus with n-side inhibitor nqno
Source: Mastigocladus laminosus. Fischerella sp.. Organism_taxid: 83541. Organism_taxid: 83541
Chain: D (161 residues) CATH domains: Unassigned 2.102.10.10
Bound ligand:   Het Group QNO is 50.00% similar to enzyme reactant Plastoquinol
4h13
Crystal structure of the cytochrome b6f complex from mastigo laminosus with tds
Source: Mastigocladus laminosus. Fischerella sp.. Organism_taxid: 83541. Organism_taxid: 83541
Chain: D (168 residues) CATH domains: Unassigned 2.102.10.10
Bound ligand:   Het Group TDS is 40.62% similar to enzyme reactant Plastoquinol
4h44
2.70 a cytochrome b6f complex structure from nostoc pcc 7120
Source: Nostoc. Organism_taxid: 103690. Strain: pcc 7120. Strain: pcc 7120
Chain: D (166 residues) CATH domains: Unassigned 2.102.10.10
Bound ligand:   Het Group MYS is 50.00% similar to enzyme reactant Plastoquinol
4i7z
Crystal structure of cytochrome b6f in dopg, with disordered iron-sulfur protein soluble domain
Source: Mastigocladus laminosus. Organism_taxid: 83541. Organism_taxid: 83541
Chain: D (38 residues)
Bound ligand:   Het Group MYS is 50.00% similar to enzyme reactant Plastoquinol