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Background  Integration of synthetic metabolic pathways to catabolically diverse chassis provides new opportunities for sustainable production. One attractive scenario is the use of abundant waste material to produce a readily collectable product, which can reduce the production costs. Towards that end, we established a cellular platform for the production of semivolatile medium-chain α-olefins from lignin-derived molecules: we constructed 1-undecene synthesis pathway in  Acinetobacter baylyi  ADP1 using ferulate, a lignin-derived model compound, as the sole carbon source for both cell growth and product synthesis.    Results  In order to overcome the toxicity of ferulate, we first applied adaptive laboratory evolution to  A. baylyi  ADP1, resulting in a highly ferulate-tolerant strain. The adapted strain exhibited robust growth in 100 mM ferulate while the growth of the wild type strain was completely inhibited. Next, we expressed two heterologous enzymes in the wild type strain to confer 1-undecene production from glucose: a fatty acid decarboxylase UndA from  Pseudomonas putida , and a thioesterase ‘TesA from  Escherichia coli . Finally, we constructed the 1-undecene synthesis pathway in the ferulate-tolerant strain. The engineered cells were able to produce biomass and 1-undecene solely from ferulate, and excreted the product directly to the culture headspace.    Conclusions  In this study, we employed a bacterium  Acinetobacter baylyi  ADP1 to integrate a natural aromatics degrading pathway to a synthetic production route, allowing the upgradation of lignin derived molecules to value-added products. We developed a highly ferulate-tolerant strain and established the biosynthesis of an industrially relevant chemical, 1-undecene, solely from the lignin-derived model compound. This study reports the production of alkenes from lignin derived molecules for the first time and demonstrates the potential of lignin as a sustainable resource in the bio-based synthesis of valuable products.    Electronic supplementary material  The online version of this article (10.1186/s12934-019-1097-x) contains supplementary material, which is available to authorized users.

Synthetic metabolic pathway for the production of 1-alkenes from lignin-derived molecules