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IPR000549 is a Photosystem I reaction center subunit V/PsaK.
<p>This entry represents Photosystem I reaction centre subunits V (PsaG) and PsaK from Cyanobacteria, Rhodophyta (red algae) and plants.</p> <p>Photosystem I (PSI) [[cite:PUB00000583]] is an integral membrane protein complex that uses light energy to mediate electron transfer from plastocyanin to ferredoxin. It is found in the chloroplasts of plants and cyanobacteria. PSI is composed of at least 14 different subunits, two of which are small hydrophobic proteins of about 7 to 9 Kd and evolutionary related, PsaG (also known as PSI-G) and PsaK (also known as PSI-K), both integral membrane proteins. Cyanobacteria contain only PsaK [[cite:PUB00002802]]. While cyanobacterial PSI have phycobilisomes to harvest light, eukaryotic PSI have a membrane-imbedded peripheral antenna [[cite:PUB00100153]].</p> <p>Oxygenic photosynthesis uses two multi-subunit photosystems (I and II) located in the cell membranes of cyanobacteria and in the thylakoid membranes of chloroplasts in plants and algae. Photosystem II (PSII) has a P680 reaction centre containing chlorophyll 'a' that uses light energy to carry out the oxidation (splitting) of water molecules, and to produce ATP via a proton pump. Photosystem I (PSI) has a P700 reaction centre containing chlorophyll that takes the electron and associated hydrogen donated from PSII to reduce NADP+ to NADPH. Both ATP and NADPH are subsequently used in the light-independent reactions to convert carbon dioxide to glucose using the hydrogen atom extracted from water by PSII, releasing oxygen as a by-product [[cite:PUB00152828]].</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 |
|---|---|---|---|---|
| Cellular component | Photosystem I | A photosystem that contains an iron-sulfur reaction center associated with accessory pigments and electron carriers. In cyanobacteria and chloroplasts, photosystem I functions as a light-dependent plastocyanin-ferredoxin oxidoreductase, transferring electrons from plastocyanin to ferredoxin; in photosynthetic bacteria that have only a single type I photosystem, such as the green sulfur bacteria, electrons can go either to ferredoxin (Fd) -> NAD+ or to menaquinone (MK) -> Cytb/FeS -> Cytc555 -> photosystem I (cyclic photophosphorylation). | ||
| Biological process | Photosynthesis | The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide (CO2) using energy obtained from light rather than from the oxidation of chemical compounds. | ||
| Cellular component | Membrane | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. |
| Transcript | Name | Description | Predicted domains | Domain count |
|---|---|---|---|---|
| – | Photosystem I subunit X precursor [Retama raetam] gi|16930767|gb|AAL32043.1|AF439284_1 | 9 | ||
| – | PREDICTED: photosystem I reaction center subunit V, chloroplastic-like [Cicer arietinum] gi|502127398|ref|XP_004499692.1| | 15 | ||
| – | Photosystem I reaction center subunit psaK; TAIR: AT1G30380.1 photosystem I subunit K; Swiss-Prot: sp|Q9SUI5|PSAK_ARATH Photosystem I reaction center subunit psaK, chloroplastic; TrEMBL-Plants: tr|I3SM84|I3SM84_LOTJA Uncharacterized protein; Found in the gene: LotjaGi1g1v0227100 | 13 | ||
| – | Photosystem I reaction center subunit V; TAIR: AT1G55670.1 photosystem I subunit G; Swiss-Prot: sp|Q9S7N7|PSAG_ARATH Photosystem I reaction center subunit V, chloroplastic; TrEMBL-Plants: tr|I3S5Z3|I3S5Z3_LOTJA Uncharacterized protein; Found in the gene: LotjaGi3g1v0331900 | 15 |
A list of co-occurring predicted domains within the L. japonicus gene space:
| Predicted domain | Source | Observations | Saturation (%) |
|---|---|---|---|
| TRANSMEMBRANE | Phobius | 1 | 25.00 |