Reaction catalyzed by sphingolipid 8-(E)-desaturase (1.14.19.18)
+
2
+
+
2
=
+
2
+
2
H2O
a (4E)-sphing-4-enine ceramide
+
2 ferrocytochrome b5
+
O2
+
2 H+
=
a (4E,8E)-sphing-4,8-dienine ceramide
+
2 ferricytochrome b5
+
2 H2O