ENZYME entry: EC 1.10.9.1

Accepted Name
Plastoquinol--plastocyanin reductase.
Alternative Name(s)
Cytochrome b6f complex.
Reaction catalysed
Plastoquinol + 2 oxidized plastocyanin + 2 H(+)(Side 1) <=> plastoquinone + 2 reduced plastocyanin + 4 H(+)(Side 2)
Comment(s)
  • Contains two b-type cytochromes, two c-type cytochromes (cn 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 1.10.2.2 (complex III) and involves electron bifurcation.
  • Formerly EC 1.10.99.1.
Cross-references
BRENDA1.10.9.1
EC2PDB1.10.9.1
ExplorEnz1.10.9.1
PRIAM enzyme-specific profiles1.10.9.1
KEGG Ligand Database for Enzyme Nomenclature1.10.9.1
IUBMB Enzyme Nomenclature1.10.9.1
IntEnz1.10.9.1
MEDLINEFind literature relating to 1.10.9.1
MetaCyc1.10.9.1
UniProtKB/Swiss-Prot
Q9L3P9, UCRIA_ANAVT;  Q9ZR03, UCRIA_ARATH;  Q7XYM4, UCRIA_BIGNA;  
P49728, UCRIA_CHLRE;  Q5CC93, UCRIA_CYAPA;  O49078, UCRIA_FRIAG;  
Q93SX0, UCRIA_NOSS1;  Q69S39, UCRIA_ORYSJ;  P26291, UCRIA_PEA;  
Q69GY7, UCRIA_SOLTU;  P08980, UCRIA_SPIOL;  P74714, UCRIA_SYNY3;  
P30361, UCRIA_TOBAC;  Q9SBN3, UCRIA_VOLCA;  Q7X9A6, UCRIA_WHEAT;  
Q93SW6, UCRIB_ANAVT;  Q5CC92, UCRIB_CYAPA;  Q93SW8, UCRIB_NOSS1;  
P26290, UCRIB_SYNY3;  Q02585, UCRIB_TOBAC;  P70758, UCRIC_NOSS1;  
Q9F722, UCRI_CHLTE;  Q46136, UCRI_CHLTI;  B8HNR1, UCRI_CYAP4;  
Q7NCE1, UCRI_GLOVI;  P83794, UCRI_MASLA;  B0JXB7, UCRI_MICAN;  
B2J3K2, UCRI_NOSP7;  P14698, UCRI_NOSSP;  A3PBI5, UCRI_PROM0;  
A2C0R9, UCRI_PROM1;  A8G3H7, UCRI_PROM2;  A2C7F6, UCRI_PROM3;  
A9BE84, UCRI_PROM4;  A2BVC4, UCRI_PROM5;  Q31C72, UCRI_PROM9;  
Q7VDC0, UCRI_PROMA;  Q7V654, UCRI_PROMM;  Q7V2L4, UCRI_PROMP;  
A2BPU5, UCRI_PROMS;  Q46GW1, UCRI_PROMT;  Q31NV7, UCRI_SYNE7;  
P0C8N7, UCRI_SYNEL;  Q2JUP1, UCRI_SYNJA;  Q2JL39, UCRI_SYNJB;  
P26292, UCRI_SYNP2;  Q5N5B0, UCRI_SYNP6;  A5GMW1, UCRI_SYNPW;  
Q7U566, UCRI_SYNPX;  A5GRU8, UCRI_SYNR3;  Q0I872, UCRI_SYNS3;  
Q3AWL7, UCRI_SYNS9;  Q3ALY0, UCRI_SYNSC;  P0C8N8, UCRI_THEEB;  
Q114L6, UCRI_TRIEI;  

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