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IPR006814 is a Photosystem II PsbR.
<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> <p>PSII is a multisubunit protein-pigment complex containing polypeptides both intrinsic and extrinsic to the photosynthetic membrane [[cite:PUB00152828], [cite:PUB00015357], [cite:PUB00015358], [cite:PUB00097583]]. Within the core of the complex, the chlorophyll and β-carotene pigments are mainly bound to the antenna proteins CP43 (PsbC) and CP47 (PsbB), which pass the excitation energy on to the reaction centre proteins D1 (Qb, PsbA) and D2 (Qa, PsbD) that bind all the redox-active cofactors involved in the energy conversion process. The PSII oxygen-evolving complex (OEC) oxidises water to provide protons for use by PSI, and consists of OEE1 (PsbO), OEE2 (PsbP) and OEE3 (PsbQ). The remaining subunits in PSII are of low molecular weight (less than 10kDa), and are involved in PSII assembly, stabilisation, dimerisation, and photo-protection [[cite:PUB00015359]].</p> <p>This family represents the low molecular weight intrinsic protein PsbR found in PSII, which is also known as the 10kDa polypeptide. The PsbR gene is found only in the nucleus of green algae and higher plants. PsbR may provide a binding site for the extrinsic oxygen-evolving complex protein PsbP to the thylakoid membrane. PsbR has a transmembrane domain to anchor it to the thylakoid membrane, and a charged N-terminal domain capable of forming ion bridges with extrinsic proteins, allowing PsbR to act as a docking protein. PsbR may be a pH-dependent stabilising protein that functions at both donor and acceptor sides of PSII [[cite:PUB00015373]].</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 II | A photosystem that contains a pheophytin-quinone reaction center with associated accessory pigments and electron carriers. In cyanobacteria and chloroplasts, in the presence of light, PSII functions as a water-plastoquinone oxidoreductase, transferring electrons from water to plastoquinone, whereas other photosynthetic bacteria carry out anoxygenic photosynthesis and oxidize other compounds to re-reduce the photoreaction center. | ||
| Cellular component | Photosystem II oxygen evolving complex | A complex, composed of a cluster of manganese, calcium and chloride ions bound to extrinsic proteins, that catalyzes the splitting of water to O2 and 4 H+. In cyanobacteria there are five extrinsic proteins in OEC (PsbO, PsbP-like, PsbQ-like, PsbU and PsbV), while in plants there are only three (PsbO, PsbP and PsbQ). | ||
| 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 | Thylakoid membrane | The pigmented membrane of any thylakoid. |
| Transcript | Name | Description | Predicted domains | Domain count |
|---|---|---|---|---|
| – | PREDICTED: photosystem II 10 kDa polypeptide, chloroplastic-like [Fragaria vesca subsp]. vesca] gi|470116076|ref|XP_004294212.1| | 9 | ||
| – | Photosystem II 10 kDa polypeptide family protein; TAIR: AT1G79040.1 photosystem II subunit R; Swiss-Prot: sp|Q40163|PSBR_SOLLC Photosystem II 10 kDa polypeptide, chloroplastic; TrEMBL-Plants: tr|I3SHR8|I3SHR8_LOTJA Uncharacterized protein; Found in the gene: LotjaGi3g1v0141700 | 14 | ||
| – | Photosystem II 10 kDa polypeptide family protein; TAIR: AT1G79040.1 photosystem II subunit R; Swiss-Prot: sp|Q40163|PSBR_SOLLC Photosystem II 10 kDa polypeptide, chloroplastic; TrEMBL-Plants: tr|I3SHR8|I3SHR8_LOTJA Uncharacterized protein; Found in the gene: LotjaGi3g1v0141700 | 9 |
A list of co-occurring predicted domains within the L. japonicus gene space:
| Predicted domain | Source | Observations | Saturation (%) |
|---|---|---|---|
| mobidb-lite | MobiDBLite | 1 | 33.33 |