Reaction: PI(4,5)P2 is dephosphorylated to PI4P by SYNJ/INPP5[1] at the plasma membrane
- in pathway: Synthesis of PIPs at the plasma membrane
At the plasma membrane, Synaptojanin-1 (SYNJ1) and -2 (SYNJ2), inositol polyphosphate 5-phosphatase K (INPP5K) aka SKIP, phosphatidylinositol 4,5-bisphosphate 5-phosphatase A (INPP5J) aka PIPP dephosphorylate phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) to form phosphatidylinositol 4-phosphate (PI4P). SYNJ1/2 both have an N-terminal Sac1-like domain, a central 5-phosphatase domain and a C-terminal proline-rich segment, with this latter part being the most divergent part of the protein sequence.
The following lists the above proteins with their corresponding literature references: SYNJ1 (Johenning et al. 2004, Haffner et al. 1997, Guo et al. 1999, Mani et al. 2007), SYNJ2 (Malecz et al. 2000), INPP5K (Injuin et al. 2000, Gurung et al. 2003), and INPP5J (Gurung et al. 2003, Mochizuki & Takenawa 1999).
The following lists the above proteins with their corresponding literature references: SYNJ1 (Johenning et al. 2004, Haffner et al. 1997, Guo et al. 1999, Mani et al. 2007), SYNJ2 (Malecz et al. 2000), INPP5K (Injuin et al. 2000, Gurung et al. 2003), and INPP5J (Gurung et al. 2003, Mochizuki & Takenawa 1999).
Reaction - small molecule participants:
Pi [cytosol]
PI4P [plasma membrane]
H2O [cytosol]
PI(4,5)P2 [plasma membrane]
Reactome.org reaction link: R-HSA-1676177
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Reaction input - small molecules:
water
1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate(5-)
Reaction output - small molecules:
hydrogenphosphate
1-phosphatidyl-1D-myo-inositol 4-phosphate
Reactome.org link: R-HSA-1676177