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https://bar.utoronto.ca/thalemine/service/ is incorrect| 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 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 [].This entry represents the low molecular weight transmembrane protein PsbJ found in PSII. PsbJ is one of the most hydrophobic proteins in the thylakoid membrane, and is located in a gene cluster with PsbE, PsbF and PsbL (PsbEFJL). Both PsbJ and PsbL ( ) are essential for proper assembly of the OEC. Mutations in PsbJ cause the light-harvesting antenna to remain detached from the PSII dimers [ ]. In addition, both PsbJ and PsbL are involved in the unidirectional flow of electrons, where PsbJ regulates the forward electron flow from D2 (Qa) to the plastoquinone pool, and PsbL prevents the reduction of PSII by back electron flow from plastoquinol protecting PSII from photo-inactivation []. | Name | Photosystem II PsbJ |
| Short Name | PSII_PsbJ | Type | Family |
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