<p> The photosynthetic apparatus in non-oxygenic bacteria consists of light-harvesting (LH) protein-pigment complexes LH1 and LH2, which use carotenoid and bacteriochlorophyll as primary donors [<cite idref="PUB00014116"/>]. LH1 acts as the energy collection hub, temporarily storing it before its transfer to the photosynthetic reaction centre (RC) [<cite idref="PUB00034760"/>]. Electrons are transferred from the primary donor via an intermediate acceptor (bacteriopheophytin) to the primary acceptor (quinine Qa), and finally to the secondary acceptor (quinone Qb), resulting in the formation of ubiquinol QbH2. RC uses the excitation energy to shuffle electrons across the membrane, transferring them via ubiquinol to the cytochrome bc1 complex in order to establish a proton gradient across the membrane, which is used by ATP synthetase to form ATP [<cite idref="PUB00034761"/>, <cite idref="PUB00015395"/>, <cite idref="PUB00015279"/>]. </p><p>The core complex is anchored in the cell membrane, consisting of one unit of RC surrounded by LH1; in some species there may be additional subunits [<cite idref="PUB00014111"/>]. RC consists of three subunits: L (light), M (medium), and H (heavy). Subunits L and M provide the scaffolding for the chromophore, while subunit H contains a cytoplasmic domain [<cite idref="PUB00034762"/>]. In <taxon tax_id="1079">Rhodopseudomonas viridis</taxon>, there is also a non-membranous tetrahaem cytochrome (4Hcyt) subunit on the periplasmic surface. </p><p> This entry describes the photosynthetic reaction centre M subunit. </p> Photosynthetic reaction centre, M subunit