Reaction catalyzed by 1-phosphatidylinositol-3-phosphate 5-kinase (2.7.1.150)

	ATP	+			=		ADP	+
	ATP	+		1-phosphatidyl-1D-myo-inositol 3-phosphate	=		ADP	+		1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate