Reaction catalyzed by succinate dehydrogenase (1.3.5.1)

		+		oxidized N,N,N\',N\'-tetramethyl-4-phenylenediamine	=			+
	succinate	+		oxidized N,N,N',N'-tetramethyl-4-phenylenediamine	=		fumarate	+		reduced N,N,N',N'-tetramethyl-4-phenylenediamine