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.
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. [PMID: 16666902]
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. [DOI] [PMID: 15579662]