Reaction catalyzed by 3-oxosteroid 1-dehydrogenase (1.3.99.4)

		+			=			+
	5alpha-pregnane-3,20-dione	+		2,6-dichlorophenol-indophenol	=		5alpha-pregn-1-en-3,20-dione	+		reduced 2,6-dichlorophenol-indophenol