Term Name:	sphingolipid delta-4 desaturase activity
Synonyms:	delta-4 sphingolipid desaturase activity
Definition:	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.
Ontology:	GO: Molecular Function [GO:0042284]    QuickGO    AmiGO