Enables succinate dehydrogenase (ubiquinone) activity. Acts upstream of or within cellular response to hypoxia and regulation of catecholamine secretion. Located in mitochondrion. Is expressed in several structures, including alimentary system; genitourinary system; nervous system; respiratory system; and sensory organ. Human ortholog(s) of this gene implicated in Carney-Stratakis syndrome; mitochondrial complex II deficiency; paraganglioma; and pheochromocytoma. Orthologous to human SDHD (succinate dehydrogenase complex subunit D). [provided by Alliance of Genome Resources, Apr 2022]