mitokondri elektrontransportahela valguline kompleks II, mis katalüüsib suktsinaadi oksüdeerumist ja ubikinooni redutseerumist, Protein complex II in the mitochondrial electron transport chain, catalyzes the oxydation of succinate and reduction of ubiquinone. Does not participate in transporting protons from matrix to the intermembrane space in mitochondria and also in creating the proton motive force.