Reaction catalyzed by UDP-4-amino-4-deoxy-L-arabinose formyltransferase (2.1.2.13)

		+			=			+
	10-formyltetrahydrofolate	+		UDP-4-amino-4-deoxy-beta-L-arabinopyranose	=		5,6,7,8-tetrahydrofolate	+		UDP-4-deoxy-4-formamido-beta-L-arabinopyranose