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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.
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FunFam 820: Cytochrome b

There are 3 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
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).
 184 A0A0A0RWV4 A0A0A0RX09 A0A0A0RX14 A0A0A0RX27 A0A0A0RXA5 A0A0A0RXB5 A0A0A0RXC3 A0A0A0RXC7 A0A0A0RXH9 A0A0A0RXK5
(174 more...)
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.
 26 A0A142FJ26 A0A142FJ27 A0A142FJ28 A0A142FJ29 A0A142FJ30 A0A142FJ31 A0A142FJ32 A0A142FJ33 A0A142FJ34 A0A142FJ35
(16 more...)
Carbon-monoxide dehydrogenase (cytochrome b-561). [EC: 1.2.2.4]
CO + H(2)O + 2 ferricytochrome b-561 = CO(2) + 2 H(+) + 2 ferrocytochrome b-561.
  • Oxygen, methylene blue and iodonitrotetrazolium chloride can act as nonphysiological electron acceptors.
 12 G9FZ02 G9FZ03 G9FZ04 G9FZ05 G9FZ07 G9FZ10 G9FZ11 I1Y6X8 I1Y6X9 I1Y6Y1
(2 more...)
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