Reaction catalyzed by 3-oxo-5alpha-steroid 4-dehydrogenase (acceptor) (1.3.99.5)

		+			=			+		reduced N,N,N\',N\'-tetramethyl-1,4-phenylendiamine
	5alpha-androstane-3,17-dione	+		N,N,N',N'-tetramethyl-1,4-phenylendiamine	=		androst-4-ene-3,17-dione	+		reduced N,N,N',N'-tetramethyl-1,4-phenylendiamine