Mitochondrial complex II of plants: subunit composition, assembly, and function in respiration and signaling

Summary Complex II [succinate dehydrogenase (succinate‐ubiquinone oxidoreductase); EC 1.3.5.1; SDH ] is the only enzyme shared by both the electron transport chain and the tricarboxylic acid ( TCA ) cycle in mitochondria. Complex II in plants is considered unusual because of its accessory subunits ( SDH 5–SDH8), in addition to the catalytic subunits of SDH found in all eukaryotes ( SDH 1–SDH4). Here, we review compositional and phylogenetic...