Reaction catalyzed by phosphatidyl-myo-inositol alpha-mannosyltransferase (2.4.1.345)

		+			=			+
	GDP-alpha-D-mannose	+		1-phosphatidyl-myo-inositol	=		GDP	+		2-O-(alpha-D-mannosyl)-1-phosphatidyl-1D-myo-inositol