Reaction catalyzed by 3-(aryl)acrylate reductase (1.3.8.15)

	3-(1H-indol-3-yl)propanoate	+		electron-transfer flavoprotein EtfA-EtfB	=			+		reduced electron-transfer flavoprotein EtfA-EtfB
	3-(1H-indol-3-yl)propanoate	+		electron-transfer flavoprotein EtfA-EtfB	=		3-(indol-3-yl)acrylate	+		reduced electron-transfer flavoprotein EtfA-EtfB