Reaction: I(1,3,4,5)P4 is dephosphorylated to I(1,3,4)P3 by INPP5[3]/ITPK1 in the cytosol
- in pathway: Synthesis of IP3 and IP4 in the cytosol
A group of inositol phosphatases and the broad specificity enzyme inositol-tetrakisphosphate 1-kinase (ITPK1) dephosphorylate inositol 1,3,4,5-tetrakisphosphate (I(1,3,4,5)P4) to inositol 1,3,4-trisphosphate (I(1,3,4)P3). The group of inositol phosphatases involved are: inositol polyphosphate 5-phosphatase OCRL-1 (OCRL), phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase 1 (INPP5D) aka SHIP1, phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase 2 (INPPL1) aka SHIP2, phosphatidylinositol 4,5-bisphosphate 5-phosphatase A (INPP5J) aka PIPP, and synaptic inositol-1,4,5-trisphosphate 5-phosphatase 1 (SYNJ1).
The following lists the above proteins with their corresponding literature references: OCRL (Chang et al. 2002, Zhang et al. 1995, Zhang et al. 1998, Schmid et al. 2004); INPP5D (Drayer et al. 1996, Kavanaugh et al. 1996); INPPL1 (Chi et al. 2004); INPP5J (Mochizuki & Thompson 1999); SYNJ1 (Schmid et al. 2004); ITPK1 (Ho et al. 2002).
The following lists the above proteins with their corresponding literature references: OCRL (Chang et al. 2002, Zhang et al. 1995, Zhang et al. 1998, Schmid et al. 2004); INPP5D (Drayer et al. 1996, Kavanaugh et al. 1996); INPPL1 (Chi et al. 2004); INPP5J (Mochizuki & Thompson 1999); SYNJ1 (Schmid et al. 2004); ITPK1 (Ho et al. 2002).
Reaction - small molecule participants:
Pi [cytosol]
I(1,3,4)P3 [cytosol]
H2O [cytosol]
I(1,3,4,5)P4 [cytosol]
Reactome.org reaction link: R-HSA-1855218
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Reaction input - small molecules:
water
1D-myo-inositol 1,3,4,5-tetrakisphosphate(8-)
Reaction output - small molecules:
hydrogenphosphate
1D-myo-inositol 1,3,4-trisphosphate(6-)
Reactome.org link: R-HSA-1855218