Figure 11.
The de novo biosynthetic pathways for the synthesis of sphinganine 1-phosphate and sphingosine 1-phosphate. Note that sphingosine is formed after turnover of ceramide and after sphinganine metabolism. Sphinganine can either be phosphorylated to form sphinganine 1-phosphate or converted to dihydroceramide. The structural differences between sphinganine-1-phosphate and sphingosine-1-phosphate are also shown. The double bond in sphingosine 1-phosphate is lacking in sphinganine 1-phosphate (arrows).