這個基因編碼琥珀酸泛醌氧化還原酶的一個主要催化亞單位，一個線粒體呼吸鏈的復合物。該復合物由四個核編碼亞單位組成，位于線粒體內膜。這種基因突變與一種線粒體呼吸鏈缺乏癥（leigh綜合征）有關。在染色體3q29上發現了一個假基因。另外，已經發現該基因編碼不同亞型的剪接轉錄變體。[由RefSeq提供，2014年6月]
This gene encodes a major catalytic subunit of succinate-ubiquinone oxidoreductase, a complex of the mitochondrial respiratory chain. The complex is composed of four nuclear-encoded subunits and is localized in the mitochondrial inner membrane. Mutations in this gene have been associated with a form of mitochondrial respiratory chain deficiency known as Leigh Syndrome. A pseudogene has been identified on chromosome 3q29. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]