acyl-lipid omega-3 desaturase (cytochrome b5) activity
Catalysis of the reaction: a (9Z,12Z)-octadecadienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome b5] + 2 H+ + O2 = (9Z,12Z,15Z)-octadecatrienoyl-containing glycerolipid + 2 Fe(III)-[cytochrome b5] + 2 H2O.
GO:0016717
oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water
is_a
1-18:1-2-18:2-phosphatidylcholine desaturase activity (SN2-18:3 forming)
exact