IUBMB Enzyme Nomenclature


Accepted name: palmitoyl-[glycerolipid] 7-desaturase

Reaction: a 1-acyl-2-palmitoyl-[glycerolipid] + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = a 1-acyl-2-[(7Z)-hexadec-7-enoyl]-[glycerolipid] + 2 oxidized ferredoxin [iron-sulfur] cluster + 2 H2O

Other name(s): FAD5

Systematic name: 1-acyl-2-palmitoyl-[glycerolipid],ferredoxin:oxygen oxidoreductase (7,8-cis-dehydrogenating)

Comments: The enzyme introduces a cis double bond at carbon 7 of a palmitoyl group attached to the sn-2 position of glycerolipids. The enzyme from the plant Arabidopsis thaliana is specific for palmitate in monogalactosyldiacylglycerol.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Kunst, L., Browse, J., Somerville, C.R. A mutant of Arabidopsis deficient in desaturation of palmitic acid in leaf lipids. Plant Physiol. 90 (1989) 943-947.

2. Heilmann, I., Mekhedov, S., King, B., Browse, J. and Shanklin, J. Identification of the Arabidopsis palmitoyl-monogalactosyldiacylglycerol Δ7-desaturase gene FAD5, and effects of plastidial retargeting of Arabidopsis desaturases on the fad5 mutant phenotype. Plant Physiol. 136 (2004) 4237-4245. [PMID: 15579662]

[EC created 2015]

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