2.7.1.158	1D-myo-inositol 1,3,4,5,6-pentakisphosphate + ATP	intermediate in both lipid-dependent and lipid-independent phytic acid biosynthetic pathways	
2.7.1.158	1D-myo-inositol 1,4,6-trisphosphate + ATP	relative substrate specificity 93.9%	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	-	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	cytoplasmic production of 1D-myo-inositol hexakisphosphate is sufficient for mediating the Gle1-mRNA export pathway	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	it is suggested that the enzyme is necessary for yolk sac development or function. Loss of inositol 1,3,4,5,6-pentakisphosphate 2-kinase is lethal	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	the enzyme may be involved in both inositol hexakisphosphate formation in maturing seeds and ATP resynthesis in germinating seeds	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	the product 1D-myo-inositol hexakisphosphate plays a role in messenger RNA export	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	rate-determining step in production of 1D-myo-inositol hexakisphosphate	
2.7.1.158	ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate	the predominant activity of StITPK1 is that of an InsP5-ADP phosphotransferase.	
2.7.1.158	additional information	loss of the 2-kinase is lethal	
2.7.1.158	additional information	capable to catalyze the phosphorylation of myo-inositol 1,4,5,6-tetrakisphosphate (relative substrate specificity 76.8%), and myo-inositol 3,4,5,6-tetrakisphosphate (relative substrate specificity 32.6%)	
2.7.1.158	additional information	StITPK1 displays inositol 3,4,5,6-tetrakisphosphate 1-kinase activity. The enzyme displays inositol 1,3,4,5,6-pentakisphosphate 1-phosphatase activity in the absence of a nucleotide acceptor and inositol 1,3,4,5,6-pentakisphosphate-ADP phosphotransferase activity in presence of physiological concentrations of ADP. Additionally, StITPK1 shows inositol phosphate-inositol phosphate phosphotransferase activity.