Biosynthesis of insect sex pheromone precursors via engineered ß-oxidation in yeast.

ABSTRACT

Mating disruption with insect sex pheromones is an attractive and environmentally friendly technique for pest management. Several Lepidoptera sex pheromones have been produced in yeast, where biosynthesis could be accomplished by the expression of fatty acyl-CoA desaturases and fatty acyl-CoA reductases. In this study, we aimed to develop yeast Yarrowia lipolytica cell factories for producing Lepidoptera pheromones which biosynthesis additionally requires ß-oxidation, such as (Z)-7-dodecenol (Z7-12OH), (Z)-9-dodecenol (Z9-12OH), and (Z)-7-tetradecenol (Z7-14OH). We expressed fatty acyl-CoA desaturases from Drosophila melanogaster (Dmd9) or Lobesia botrana (Lbo_PPTQ) and fatty acyl-CoA reductase from Helicoverpa armigera (HarFAR) in combinations with 11 peroxisomal oxidases of different origins. Yeast cultivations were performed with supplementation of methyl myristate (14Me). The oxidase Lbo_31670 from L. botrana provided the highest titers of (Z)-7-dodecenoate, (Z)-9-dodecenoate, and (Z)-7-tetradecenoate. However, no chain-shortened fatty alcohols were produced. The mutation of fatty acid synthase (Fas2pI1220F) to increase myristate production did not lead to targeted fatty alcohol production. The problem was solved by directing the reductase into peroxisomes, where the strain with Dmd9 produced 0.10 ± 0.02 mg/l of Z7-12OH and 0.48 ± 0.03 mg/l of Z7-14OH, while the strain with Lbo_PPTQ produced 0.21 ± 0.03 mg/l of Z9-12OH and 0.40 ± 0.07 mg/l of Z7-14OH. In summary, the engineering of ß-oxidation in Y. lipolytica allowed expanding the portfolio of microbially produced insect sex pheromones.