Reaction catalyzed by proline dehydrogenase (1.5.5.2), proline dehydrogenase (acceptor) (1.5.99.B2)

		+		oxidized dichlorophenolindophenol	=			+
	L-proline	+		oxidized dichlorophenolindophenol	=		1-pyrroline-5-carboxylate	+		reduced dichlorophenolindophenol