Reaction catalyzed by procollagen galactosyltransferase (2.4.1.50)

		+			=			+
	UDP-alpha-D-galactose	+		[procollagen]-(5R)-5-hydroxy-L-lysine	=		UDP	+		[procollagen]-(5R)-5-O-(beta-D-galactosyl)-5-hydroxy-L-lysine