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- Complex II + ([[File:CII.png |right|200px|link=Gnaiger 2 … [[File:CII.png |right|200px|link=Gnaiger 2023 MitoFit CII]]</br>'''Complex II''' or '''succinate:quinone oxidoreductase (SQR)''' is the only membrane-bound enzyme in the [[TCA cycle]] and is part of the [[electron transfer pathway]]. The reversible oxidoreduction of succinate and fumarate is catalyzed in a soluble domain and coupled to the reversible oxidoreduction of quinol and quinone in the mitochondrial inner membrane. CII consists in most species of four subunits. The flavoprotein [[succinate dehydrogenase]] is the largest polypeptide of CII, located on the matrix face of the mt-inner membrane. Succinate:quinone oxidoreductases (SQRs, SDHABCD) favour oxidation of succinate and reduction of quinone in the canonical forward direction of the TCA cycle and electron transfer into the [[Q-junction]]. In contrast, quinol:fumarate reductases (QFRs, fumarate reductases, FRDABCD) tend to operate in the reverse direction reducing fumarate and oxidizing quinol.on reducing fumarate and oxidizing quinol.)
