ID 1.14.19.34 DE acyl-lipid (9+3)-(E)-desaturase. AN acyl-lipid 12-(E)-desaturase. CA (1) a (9Z)-octadecenoyl-containing glycerolipid + 2 Fe(II)-[cytochrome CA b5] + 2 H(+) + O2 = a (9Z,12E)-octadecadienoyl-containing glycerolipid + CA 2 Fe(III)-[cytochrome b5] + 2 H2O. CA (2) a (9Z)-hexadecenoyl-containing glycerolipid + 2 Fe(II)-[cytochrome CA b5] + 2 H(+) + O2 = a (9Z,12E)-hexadecadienoyl-containing glycerolipid + CA 2 Fe(III)-[cytochrome b5] + 2 H2O. CC -!- The enzymes from the plants Dimorphotheca sinuata (African daisy) and CC Vernicia fordii (tung oil tree) insert a trans double bond in CC position C-12 of oleate and palmitoleate incorporated into CC glycerolipids. CC -!- The enzyme introduces the new double bond at a position three carbons CC away from an existing double bond at position 9, toward the methyl CC end of the fatty acid. CC -!- The enzyme from tung oil tree also possesses the activity of CC EC 1.14.19.33. DR Q6RS95, FAD21_DIMSI; Q8GZC2, FADX_VERFO ; //