Reaction catalyzed by O-phospho-L-seryl-tRNASec:L-selenocysteinyl-tRNA synthase (2.9.1.2)

	L-phosphoseryl-tRNASec	+			=			+
	L-phosphoseryl-tRNASec	+		selenophosphate	=		L-selenocysteinyl-tRNASec	+		phosphate