Reaction catalyzed by tRNA 2-selenouridine synthase (2.9.1.3)

		+		5-methylaminomethyl-2-thiouridine34 in tRNA	=		5-methylaminomethyl-2-(S-geranyl)thiouridine34 in tRNA	+
	geranyl diphosphate	+		5-methylaminomethyl-2-thiouridine34 in tRNA	=		5-methylaminomethyl-2-(S-geranyl)thiouridine34 in tRNA	+		diphosphate