title: A multifunctional desaturase involved in the biosynthesis of the processionary moth sex pheromone.
abstract: The sex pheromone of the female processionary moth, Thaumetopoea pityocampa, is a unique C16 enyne acetate that is biosynthesized from palmitic acid. Three consecutive desaturation reactions transform this saturated precursor into the triunsaturated fatty acyl intermediate: formation of (Z)-11-hexadecenoic acid, acetylenation to 11-hexadecynoic acid, and final Delta(13) desaturation to (Z)-13-hexadecen-11-ynoic acid. By using degenerate primers common to all reported insect desaturases, a single cDNA sequence was isolated from total RNA of T. pityocampa female pheromone glands. The full-length transcript of this putative desaturase was expressed in elo1Delta/ole1Delta yeast mutants (both elongase 1 and Delta(9) desaturase-deficient) for functional assays. The construct fully rescued the Deltaole1 yeast phenotype, confirming its desaturase activity. Analysis of the unsaturated products from transformed yeast extracts demonstrated that the cloned enzyme showed Delta(11) desaturase, Delta(11) acetylenase, and Delta(13) desaturase activities. Therefore, this single desaturase may account for the three desaturation steps involved in the sex pheromone biosynthetic pathway of the processionary moth.
authors.affiliation: Research Unit on BioActive Molecules (RUBAM), Departament de Química Orgànica Biològica, Institut d'Investigacions Químiques i Ambientals de Barcelona, Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain.
authors.forename: Montserrat
authors.initials: M
authors.lastname: Serra
authors.forename: Benjamin
authors.initials: B
authors.lastname: Piña
authors.forename: José Luis
authors.initials: JL
authors.lastname: Abad
authors.forename: Francisco
authors.initials: F
authors.lastname: Camps
authors.forename: Gemma
authors.initials: G
authors.lastname: Fabriàs
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D044943:Fatty Acid Desaturases / Q000145:classification* / Q000235:genetics / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000096:biosynthesis* / Q000737:chemistry; D005260:Female; D008969:Molecular Sequence Data; D009036:Moths / Q000201:enzymology*; D010802:Phylogeny; D012724:Sex Attractants / Q000096:biosynthesis* / Q000737:chemistry
chemical_list: C524873:13-hexadecen-11-ynoic acid; D005231:Fatty Acids, Unsaturated; D012724:Sex Attractants; D044943:Fatty Acid Desaturases