sphingolipid delta-4 desaturase activity
sphingolipid delta-4 desaturase activity
Catalysis of the reaction: an N-acylsphinganine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H+ = an N-acylsphing-4-enine + 2 Fe(III)-[cytochrome b5] + 2 H2O.