View in Gene3D

CATH Superfamily 1.20.810.10

Cytochrome Bc1 Complex; Chain C

The name of this superfamily has been modified since the most recent official CATH+ release (v4_2_0). At the point of the last release, this superfamily was named:

"
Cytochrome Bc1 Complex; Chain C
".

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
« Back to all FunFams

FunFam 6689: Cytochrome b6

There are 2 EC terms in this cluster

Please note: EC annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

Note: The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.

EC Term Annotations Evidence
Plastoquinol--plastocyanin reductase. [EC: 1.10.9.1]
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 (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.
 21 A0A127KL18 A0A127KL76 A0A193DUW7 A0A193DUX0 A0A193DUX2 A0A193DUX3 A0A193DUY2 A0A193DUY5 A0A193DV29 A0A193DV33
(11 more...)
Quinol--cytochrome-c reductase. [EC: 1.10.2.2]
Quinol + 2 ferricytochrome c = quinone + 2 ferrocytochrome c + 2 H(+).
  • The enzyme, often referred to as the cytochrome bc1 complex or complex III, is the third complex in the electron transport chain.
  • It is present in the mitochondria of all aerobic eukaryotes and in the inner membranes of most bacteria.
  • The mammalian enzyme contains cytochromes b-562, b-566 and C(1), and a 2-iron ferredoxin.
  • Depending on the organism and physiological conditions, the enzyme extrudes either two or four protons from the cytoplasmic to the non- cytoplasmic compartment (cf. EC 1.6.99.3).
 6 A0A0K2GHJ9 A0A0W8G1H1 A0A1N7IQB9 D8PJI7 F5SBK4 F9DNR4
CATH-Gene3D is a Global Biodata Core Resource Learn more...