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IPR000932 is a Photosystem antenna protein-like.
<p>This entry represents the intrinsic antenna proteins CP43 (PsbC) and CP47 (PsbB) found in the reaction centre of PSII. These polypeptides bind to chlorophyll a and beta-carotene and pass the excitation energy on to the reaction centre [[cite:PUB00015360]]. This entry also includes the iron-stress induced chlorophyll-binding protein CP43' (IsiA), which evolved in cyanobacteria from a PSII protein to cope with light limitations and stress conditions. Under iron-deficient growth conditions, CP43' associates with PSI to form a complex that consists of a ring of 18 or more CP43' molecules around a PSI trimer, which significantly increases the light-harvesting system of PSI. IsiA can also provide photoprotection for PSII [[cite:PUB00015361]].</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>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 | A complex located in a photosynthetic membrane that consists of a photoreaction center associated with accessory pigments and electron carriers. Examples of this component are found in Arabidopsis thaliana and in photosynthetic bacterial and archaeal species. | ||
| Biological process | Photosynthetic electron transport chain | A process, occurring as part of photosynthesis, in which light provides the energy for a series of electron carriers to operate together to transfer electrons and 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 | Chlorophyll binding | Interacting selectively and non-covalently with chlorophyll; any compound of magnesium complexed in a porphyrin (tetrapyrrole) ring and which functions as a photosynthetic pigment. | ||
| Biological process | Photosynthesis, light reaction | The light reactions of photosynthesis, which take place in photosystems II and I. Light energy is harvested and used to power the transfer of electrons among a series of electron donors and acceptors. The final electron acceptor is NADP+, which is reduced to NADPH. NADPH generated from light reactions is used in sugar synthesis in dark reactions. Light reactions also generate a proton motive force across the thylakoid membrane, and the proton gradient is used to synthesize ATP. There are two chemical reactions involved in the light reactions: water oxidation in photosystem II, and NADP reduction in photosystem I. |
| Transcript | Name | Description | Predicted domains | Domain count |
|---|---|---|---|---|
| – | Photosystem II cp47 protein [Cuttsia viburnea] gi|305672090|gb|ADM63446.1| | 5 | ||
| – | RecName: Full=Photosystem II CP43 chlorophyll apoprotein; AltName: Full=PSII 43 kDa protein; AltName: Full=Photosystem II 44 kDa reaction center protein; AltName: Full=Protein CP-43; AltName: Full=Protein P6; Flags: Precursorgi|163937813|dbj|BAB33190.2| PSII 43 KDa protein [Lotus japonicus] gi|172045764|sp|Q9BBT1.2|PSBC_LOTJA | 10 | ||
| – | Photosystem II CP43 protein [Saxifraga rivularis] gi|300079152|gb|ADJ67447.1| | 9 | ||
| – | Photosystem II CP43 protein [Myricaria germanica] gi|332983528|gb|AEF01563.1| | 9 | ||
| – | Photosystem II P680 chlorophyll A apoprotein [Oenothera elata subsp]. elata] gi|168824507|gb|ACA30556.1| | 8 | ||
| – | Photosystem II 47 kDa protein [Lotus japonicus] gi|13518464|ref|NP_084823.1| | 11 | ||
| – | Photosystem II CP43 reaction center protein; TAIR: ATCG00280.1 photosystem II reaction center protein C (ChrC); Swiss-Prot: sp|Q9BBT1|PSBC_LOTJA Photosystem II CP43 reaction center protein; TrEMBL-Plants: tr|A0A0K0LN09|A0A0K0LN09_WISFL Photosystem II CP43 reaction center protein; Found in the gene: LotjaGi6g1v0065000_LC | 11 | ||
| – | Photosystem II CP43 reaction center protein; TAIR: ATCG00280.1 photosystem II reaction center protein C (ChrC); Swiss-Prot: sp|Q9BBT1|PSBC_LOTJA Photosystem II CP43 reaction center protein; TrEMBL-Plants: tr|A0A0K0LN09|A0A0K0LN09_WISFL Photosystem II CP43 reaction center protein; Found in the gene: LotjaGi6g1v0065000_LC | 11 |
A list of co-occurring predicted domains within the L. japonicus gene space:
| Predicted domain | Source | Observations | Saturation (%) |
|---|---|---|---|
| TRANSMEMBRANE | Phobius | 1 | 12.50 |