Sphinganine C4-monooxygenase (EC 1.14.13.169, sphingolipid C4-hydroxylase, SUR2 (gene), SBH1 (gene), SBH2 (gene)) is an enzyme with systematic name sphinganine,NADPH:oxygen oxidoreductase (C4-hydroxylating). This enzyme catalyses the following chemical reactionsphinganine + NADPH + H+ + O2 phytosphingosine + NADP+ + H2O