The diphosphoinositol pentakisphosphate kinase 2 (PPIP5K2) plays critical roles in cell signaling and bioenergetic homeostasis. PPIP5K2 is remarkable for the reversible nature of its kinase activity, its unique ligand-stimulated ATPase activity, and the substrate traveling between two ligand-binding sites. PPIP5K2 mediates cellular phosphate homestasis, since its kinase activity acts as a sensor of extracellular inorganic phosphate levels, dysfunctional PPIP5K2 activity in the inner ear results in hair cell loss and deafness. Mutations in PPIP5K2 gene are associated with hearing loss in human and mouse.
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