Inositol polyphosphate 5-phosphatase K

Definition:

Inositol 5-phosphatase which acts on inositol 1,4,5-trisphosphate, inositol 1,3,4,5-tetrakisphosphate, phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol 3,4,5-trisphosphate. Has 6-fold higher affinity for phosphatidylinositol 4,5-bisphosphate than for inositol 1,4,5-trisphosphate. Negatively regulates assembly of the actin cytoskeleton. Controls insulin-dependent glucose uptake among inositol 3,4,5-trisphosphate phosphatases; therefore, is the specific regulator for insulin signaling in skeletal muscle (By similarity).

References:

[1]. T Ijuin, et al. Identification and characterization of a novel inositol polyphosphate 5-phosphatase. J Biol Chem. 2000 Apr 14;275(15):10870-5. [Content Brief]

[2]. Fabrice Vandeput, et al. The influence of anionic lipids on SHIP2 phosphatidylinositol 3,4,5-trisphosphate 5-phosphatase activity. Cell Signal. 2006 Dec;18(12):2193-9. [Content Brief]

[3]. Daniel P S Osborn, et al. Mutations in INPP5K Cause a Form of Congenital Muscular Dystrophy Overlapping Marinesco-Sjögren Syndrome and Dystroglycanopathy. Am J Hum Genet. 2017 Mar 2;100(3):537-545. [Content Brief]

[4]. Manuela Wiessner, et al. Mutations in INPP5K, Encoding a Phosphoinositide 5-Phosphatase, Cause Congenital Muscular Dystrophy with Cataracts and Mild Cognitive Impairment. Am J Hum Genet. 2017 Mar 2;100(3):523-536. [Content Brief]

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