2.7.1.134 | more |
substrate docking calculations, substrate specificity of Arabidopsis thaliana ITPK1, overview. Lack of Ins(1,4,5,6)P4/Ins(3,4,5,6) P4 product for Ins(1,4,6)P3 or Ins(3,4,6)P3 substrates. Consistent with the phosphorylation of the enantiomeric pair Ins(1,4,5,6)P4/Ins (3,4,5,6)P4, ITPK1 shows phosphorylation of Ins(1,4,6)P3 at the 3-position and Ins(3,4,6)P3 at the 1-position. ITPK1 has robust enantiospecific hydroxykinase activity against Ins(3,4,5,6)P4. With inositol tris/tetrakisphosphate kinase 1 (ITPK1, EC 2.7.1.134) and inositol pentakisphosphate 2-kinase (IPK1, EC 2.7.1.158) combined at a 1:20 ATP:ADP ratio, InsP6 is converted via Ins(1,3,4,5,6)P5 to Ins(3,4,5,6) P4 and/or Ins(1,4,5,6)P4 with concomitant generation of ATP |
Arabidopsis thaliana |
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