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IPR005798 is a Cytochrome b/b6, C-terminal.
<p>In the mitochondrion of eukaryotes and in aerobic prokaryotes, cytochrome b is a component of respiratory chain complex III ([ec:1.10.2.2]) - also known as the bc1 complex or ubiquinol-cytochrome c reductase. In plant chloroplasts and cyanobacteria, there is a analogous protein, cytochrome b6, a component of the plastoquinone-plastocyanin reductase ([ec:1.10.99.1]), also known as the b6f complex.</p> <p>Cytochrome b/b6 [[cite:PUB00003404], [cite:PUB00000640]] is an integral membrane protein of approximately 400 amino acid residues that probably has 8 transmembrane segments. In plants and cyanobacteria, cytochrome b6 consists of two subunits encoded by the petB and petD genes. The sequence of petB is colinear with the N-terminal part of mitochondrial cytochrome b, while petD corresponds to the C-terminal part. Cytochrome b/b6 non-covalently binds two haem groups, known as b562 and b566. Four conserved histidine residues are postulated to be the ligands of the iron atoms of these two haem groups.</p> <p>Apart from regions around some of the histidine haem ligands, there are a few conserved regions in the sequence of b/b6. The best conserved of these regions includes an invariant P-E-W triplet which lies in the loop that separates the fifth and sixth transmembrane segments. It seems to be important for electron transfer at the ubiquinone redox site - called Qz or Qo (where o stands for outside) - located on the outer side of the membrane. This entry is the C terminus of these proteins.</p>
This description is obtained from EB-eye REST.
GO predictions are based solely on the InterPro-to-GO mappings published by EMBL-EBI, which are in turn based on the mapping of predicted domains to the InterPro dataset. The InterPro-to-GO mapping was last updated on , while the GO metadata was last updated on .
| GO term | Namespace | Name | Definition | Relationships |
|---|---|---|---|---|
| Molecular function | Electron transfer activity | Any molecular entity that serves as an electron acceptor and electron donor in an electron transport chain. An electron transport chain is a process in which a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient. | ||
| Cellular component | Membrane | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. | ||
| Molecular function | Oxidoreductase activity | Catalysis of an oxidation-reduction (redox) reaction, a reversible chemical reaction in which the oxidation state of an atom or atoms within a molecule is altered. One substrate acts as a hydrogen or electron donor and becomes oxidized, while the other acts as hydrogen or electron acceptor and becomes reduced. |
| Transcript | Name | Description | Predicted domains | Domain count |
|---|---|---|---|---|
| – | PREDICTED: cytochrome b-like [Cicer arietinum] gi|502166150|ref|XP_004513805.1| | 16 | ||
| – | Cytochrome b6/f complex subunit IV (chloroplast) [Tectona grandis] gi|442742993|ref|YP_007353945.1| | 16 | ||
| – | Cytochrome b6/f complex subunit IV [Lotus japonicus] gi|13518469|ref|NP_084828.1| | 16 | ||
| – | Cytochrome b [Medicago truncatula] gi|357436139|ref|XP_003588345.1| | 21 | ||
| – | Cytochrome b; TAIR: AT2G07727.1 cytochrome b; Swiss-Prot: sp|P05718|CYB_VICFA Cytochrome b; TrEMBL-Plants: tr|A0A0B4L2G9|A0A0B4L2G9_9ROSA Cytochrome b; Found in the gene: LotjaGi4g1v0121100_LC | 11 | ||
| – | Cytochrome b6-f complex subunit 4; TAIR: ATCG00730.1 photosynthetic electron transfer D (ChrC); Swiss-Prot: sp|Q9BBQ5|PETD_LOTJA Cytochrome b6-f complex subunit 4; TrEMBL-Plants: tr|A0A1D8R9R1|A0A1D8R9R1_9MAGN Cytochrome b6-f complex subunit 4; Found in the gene: LotjaGi5g1v0223700 | 18 | ||
| – | Cytochrome b6-f complex subunit 4; TAIR: ATCG00730.1 photosynthetic electron transfer D (ChrC); Swiss-Prot: sp|Q9BBQ5|PETD_LOTJA Cytochrome b6-f complex subunit 4; TrEMBL-Plants: tr|A0A1B1FK37|A0A1B1FK37_POGCB Cytochrome b6-f complex subunit 4; Found in the gene: LotjaGi5g1v0223700 | 17 |
A list of co-occurring predicted domains within the L. japonicus gene space:
| Predicted domain | Source | Observations | Saturation (%) |
|---|---|---|---|
| cd00290 | CDD | 1 | 14.29 |