Complex II [succinate dehydrogenase (succinate-ubiquinone oxidoreductase); SDH] is the only enzyme shared by both the electron transport chain and the tricarboxylic acid (TCA) cycle in mitochondria. In plants, this complex is considered unusual because it has accessory subunits (SDH5-SDH8), in addition to the catalytic subunits of SDH found in all eukaryotes (SDH1- SDH4). This family represents the accessory complex II subunit Succinate dehydrogenase subunit 5 mitochondrial, from plants [1,2].

1: Mitochondrial cytochrome c oxidase and succinate dehydrogenase complexes contain\tplant specific subunits. Millar AH, Eubel H, Jansch L, Kruft V, Heazlewood JL, Braun HP; Plant Mol Biol. 2004;56:77-90. PMID:15604729

2: Mitochondrial complex II of plants: subunit composition, assembly, and function in respiration and signaling. Huang S, Braun HP, Gawryluk RMR, Millar AH; Plant J. 2019;98:405-417. PMID:30604579