ExplorEnz: EC 1.14.19.39

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1.14.19.39

Accepted name:

acyl-lipid Δ¹²-acetylenase

Reaction:

linoleoyl-[glycerolipid] + 2 ferrocytochrome b₅ + O₂ + 2 H⁺ = crepenynyl-[glycerolipid] + 2 ferricytochrome b₅ + 2 H₂O

Glossary:

crepenynate = (9Z)-octadec-9-en-12-ynoate

Systematic name:

Δ¹² acyl-lipid,ferrocytochrome-b₅:oxygen oxidoreductase (12,13-dehydrogenating)

Comments:

The enzyme, characterized from the plant Crepis alpina, converts the double bond at position 12 of linoleate into a triple bond. The product is the main fatty acid found in triacylglycerols in the seed oil of Crepis alpina.

Links to other databases:

BRENDA, EXPASY, Gene, KEGG, MetaCyc

References:

1.	Banas, A., Bafor, M., Wiberg, E., Lenman, M., Staahl, U. and Stymne, S. Biosynthesis of an acetylenic fatty acid in microsomal preparations from developing seeds Crepis alpina. Physiol. Biochem. Mol. Biol. Plant. [Proc. Int. Symp. Plant Lipids] 12th (1997) 57–59.
2.	Lee, M., Lenman, M., Banas, A., Bafor, M., Singh, S., Schweizer, M., Nilsson, R., Liljenberg, C., Dahlqvist, A., Gummeson, P.O., Sjodahl, S., Green, A. and Stymne, S. Identification of non-heme di-iron proteins that catalyze triple bond and epoxy group formation. Science 280 (1998) 915–918. [DOI] [PMID: 9572738]
3.	Nam, J.W. and Kappock, T.J. Cloning and transcriptional analysis of Crepis alpina fatty acid desaturases affecting the biosynthesis of crepenynic acid. J. Exp. Bot. 58 (2007) 1421–1432. [DOI] [PMID: 17329262]

[EC 1.14.19.39 created 2000 as EC 1.14.99.33, transferred 2015 to EC 1.14.19.39]