Enhanced (<i>S</i>)-linalool production by fusion expression of farnesyl diphosphate synthase and linalool synthase in <i>Saccharomyces cerevisiae</i>

Abstract

AIMS: In order to improve the availability of geranyl diphosphate (GPP) in the mevalonate pathway for enhancing (S)-linalool production in Saccharomyces cerevisiae. METHODS AND RESULTS: A (S)-linalool synthase (LIS): AaLS1 from Actinidia arguta was coexpressed with FPPS with different peptide linkers to redirect the flux from geranyl diphosphate (GPP) to (S)-linalool production in S. cerevisiae. The strain with the best peptide linker ((GGGGS)3 ), produced 101·55 ± 2·97 μg l(-1) (S)-linalool, a 69·7% increase compared to those with two independent LIS and FPPS expressed. In a 3-l fermenter, the (S)-linalool titre was further improved to 240·64 ± 5·31 μg l(-1) . CONCLUSIONS: The results demonstrate that the fusion proteins catalysing consecutive steps in a metabolic pathway significantly improved the (S)-linalool production with GPP as precursor. SIGNIFICANCE AND IMPACT OF THE STUDY: The fusion protein strategy co-expressing AaLS1 and FPPS, assembled with a long peptide linker made S. cerevisiae produced the highest reported (S)-Linalool titre to date.