ID 1.14.19.39 DE acyl-lipid Delta(12)-acetylenase. AN Delta12 fatty acid acetylenase. CA a (9Z,12Z)-octadecadienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome CA b5] + 2 H(+) + O2 = a (9Z)-octadec-9-en-12-ynoyl-containing glycerolipid CA + 2 Fe(III)-[cytochrome b5] + 2 H2O. CC -!- The enzyme, characterized from the plant Crepis alpina, converts the CC double bond at position 12 of linoleate into a triple bond. CC -!- The product is the main fatty acid found in triacylglycerols in the CC seed oil of Crepis alpina. CC -!- Formerly EC 1.14.99.33. DR O81931, FAD12_CREAL; //