Catalytic activity:ATP + sphinganine = ADP + sphinganine 1-phosphate. ,Catalytic activity:ATP + sphingosine = ADP + sphingosine 1-phosphate. ,cofactor:Magnesium. ,Function:Catalyzes the phosphorylation of sphingosine to form sphingosine 1-phosphate (SPP) , a lipid mediator with both intra-and extracellular functions. Also acts on D-erythro-sphingosine and to a lesser extent sphinganine , but not other lipids , such as D ,L-threo-dihydrosphingosine , N ,N-dimethylsphingosine , diacylglycerol , ceramide , or phosphatidylinositol. ,similarity:Contains 1 DAGKc domain. ,subunit:Interacts with ACY1 (By similarity) . Binds to calmodulin. Interacts with SPHKAP. ,tissue specificity:Widely expressed with highest levels in adult liver , kidney , heart and skeletal muscle. ,
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