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IPR009388 is a Photosystem II PsbY.
<p>This family represents the low molecular weight transmembrane protein PsbY found in PSII. In higher plants, two related PsbY proteins exist, PsbY-1 and PsbY-2, which appear to function as a heterodimer. In spinach and Arabidopsis, these two proteins arise from a single-copy nuclear gene that is processed in the chloroplast. By contrast, prokaryotic and organellar chromosomes encode a single PsbY protein, as found in cyanobacteria and red algae, indicating a duplication event in the evolution of higher plants [[cite:PUB00015379]]. PsbY has two low manganese-dependent activities: a catalase-like activity and an L-arginine metabolising activity that converts L-arginine into ornithine and urea [[cite:PUB00012313]]. In addition, a redox-active group is thought to be present in the protein. In cyanobacteria, PsbY deletion mutants have a slightly impaired PSII that is less capable of coping with low levels of calcium ions than the wild-type.</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> <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>
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. | ||
| 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 | Integral component of membrane | The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. | ||
| Molecular function | Manganese ion binding | Interacting selectively and non-covalently with manganese (Mn) ions. |
| Transcript | Name | Description | Predicted domains | Domain count |
|---|---|---|---|---|
| – | PREDICTED: photosystem II core complex proteins psbY, chloroplastic-like [Glycine max] gi|356540203|ref|XP_003538579.1| | 9 | ||
| – | PREDICTED: photosystem II core complex proteins psbY, chloroplastic-like [Glycine max] gi|356540203|ref|XP_003538579.1| | 9 | ||
| – | PREDICTED: photosystem II core complex proteins psbY, chloroplastic-like [Vitis vinifera] gi|225424556|ref|XP_002285325.1| | 9 | ||
| – | Photosystem II core complex proteins psbY; TAIR: AT1G67740.1 photosystem II BY; Swiss-Prot: sp|P80470|PSBY_SPIOL Photosystem II core complex proteins psbY, chloroplastic; TrEMBL-Plants: tr|I3T1P2|I3T1P2_LOTJA Uncharacterized protein; Found in the gene: LotjaGi6g1v0097400 | 9 | ||
| – | Photosystem II core complex proteins psbY; TAIR: AT1G67740.1 photosystem II BY; Swiss-Prot: sp|P80470|PSBY_SPIOL Photosystem II core complex proteins psbY, chloroplastic; TrEMBL-Plants: tr|I3T1P2|I3T1P2_LOTJA Uncharacterized protein; Found in the gene: LotjaGi6g1v0097500 | 9 |
A list of co-occurring predicted domains within the L. japonicus gene space:
| Predicted domain | Source | Observations | Saturation (%) |
|---|---|---|---|
| TRANSMEMBRANE | Phobius | 1 | 20.00 |