Protein Domain : IPR010527

Type:  Family Name:  Photosystem II PsbU, oxygen evolving complex
Description:  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.PSII is a multisubunit protein-pigment complex containing polypeptides both intrinsic and extrinsic to the photosynthetic membrane [, ]. Within the core of the complex, the chlorophyll and beta-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 10 kDa), and are involved in PSII assembly, stabilisation, dimerisation, and photo-protection []. In PSII, the oxygen-evolving complex (OEC) is responsible for catalysing the splitting of water to O(2) and 4H+. The OEC is composed of a cluster of manganese, calcium and chloride ions bound to extrinsic proteins. 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), PsbU and PsbV having been lost during the evolution of green plants [].This family represents the PSII extrinsic protein PsbU, which forms part of the OEC in cyanobacteria and red algae. PsbU acts to stabilise the oxygen-evolving machinery of PSII against heat-induced inactivation, which is crucial for cellular thermo-tolerance []. Short Name:  PSII_PsbU
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0 Child Features

0 Contains

2 Cross Referencess

Identifier
PF06514
MF_00589

0 Found In

5 GO Annotations

GO Term Gene Name
GO:0015979 IPR010527
GO:0042549 IPR010527
GO:0009523 IPR010527
GO:0009654 IPR010527
GO:0019898 IPR010527

5 Ontology Annotations

GO Term Gene Name
GO:0015979 IPR010527
GO:0042549 IPR010527
GO:0009523 IPR010527
GO:0009654 IPR010527
GO:0019898 IPR010527

0 Parent Features

2 Proteins

DB identifier UniProt Accession Secondary Identifier Organism Name Length
Pum0203s0001.1.p A0A1X6P620 PAC:38010571 Porphyra umbilicalis 99  
Pum1541s0001.1.p A0A1X6NM48 PAC:38011473 Porphyra umbilicalis 149  

5 Publications

First Author Title Year Journal Volume Pages PubMed ID
            12518057
            14871485
            15100025
            15258264
            10318707