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ENZYME

ENZYME entry: EC 7.1.1.6

Accepted Name
plastoquinol--plastocyanin reductase
Alternative Name(s)
cytochrome b6f complex
Reaction catalysed
a plastoquinol + 2 H(+)(in) + 2 oxidized [plastocyanin] = a plastoquinone + 4 H(+)(out) + 2 reduced [plastocyanin]
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 7.1.1.8 (complex III) and involves electron bifurcation.
  • Formerly EC 1.10.9.1 and EC 1.10.99.1.
Cross-references
BRENDA7.1.1.6
EC2PDB7.1.1.6
ExplorEnz7.1.1.6
PRIAM enzyme-specific profiles7.1.1.6
KEGG Ligand Database for Enzyme Nomenclature7.1.1.6
IUBMB Enzyme Nomenclature7.1.1.6
IntEnz7.1.1.6
MEDLINEFind literature relating to 7.1.1.6
MetaCyc7.1.1.6
Rhea expert-curated reactions7.1.1.6
UniProtKB/Swiss-Prot
Q9ZR03, UCRIA_ARATHQ7XYM4, UCRIA_BIGNAP49728, UCRIA_CHLRE
Q5CC93, UCRIA_CYAPAO49078, UCRIA_FRIAGQ93SX0, UCRIA_NOSS1
Q69S39, UCRIA_ORYSJP26291, UCRIA_PEAQ69GY7, UCRIA_SOLTU
P08980, UCRIA_SPIOLP74714, UCRIA_SYNY3P30361, UCRIA_TOBAC
Q9L3P9, UCRIA_TRIV2Q9SBN3, UCRIA_VOLCAQ7X9A6, UCRIA_WHEAT
Q5CC92, UCRIB_CYAPAQ93SW8, UCRIB_NOSS1P26290, UCRIB_SYNY3
Q02585, UCRIB_TOBACQ93SW6, UCRIB_TRIV2P70758, UCRIC_NOSS1
Q9F722, UCRI_CHLTEQ46136, UCRI_CHLTIB8HNR1, UCRI_CYAP4
P14698, UCRI_DESSPQ7NCE1, UCRI_GLOVIP83794, UCRI_MASLA
B0JXB7, UCRI_MICANB2J3K2, UCRI_NOSP7Q7U566, UCRI_PARMW
P26292, UCRI_PICP2A3PBI5, UCRI_PROM0A2C0R9, UCRI_PROM1
A8G3H7, UCRI_PROM2A2C7F6, UCRI_PROM3A9BE84, UCRI_PROM4
A2BVC4, UCRI_PROM5Q31C72, UCRI_PROM9Q7VDC0, UCRI_PROMA
Q7V654, UCRI_PROMMQ7V2L4, UCRI_PROMPA2BPU5, UCRI_PROMS
Q46GW1, UCRI_PROMTQ31NV7, UCRI_SYNE7P0C8N7, UCRI_SYNEL
Q2JUP1, UCRI_SYNJAQ2JL39, UCRI_SYNJBQ5N5B0, UCRI_SYNP6
A5GMW1, UCRI_SYNPWA5GRU8, UCRI_SYNR3Q0I872, UCRI_SYNS3
Q3AWL7, UCRI_SYNS9Q3ALY0, UCRI_SYNSCP0C8N8, UCRI_THEVB
Q114L6, UCRI_TRIEI

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