Reaction catalyzed by acyl-CoA 6-desaturase (1.14.19.3)
+
AH2
+
=
+
A
+
2
H2O
alpha-linolenic acid
+
AH2
+
O2
=
octadec-6,9,12,15-tetraenoic acid
+
A
+
2 H2O