Journal
JOURNAL OF FUNGI
Volume 9, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/jof9040494
Keywords
tritactic acid lactone (TAL); acetyl-CoA; phosphoketolase; phosphotransacetylase pathway; xylose utilization; methanol biotransformation; Pichia pastoris
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In this study, an engineered Pichia pastoris strain was constructed for the production of Triacetic acid lactone (TAL). The TAL biosynthetic pathway was introduced by integrating a 2-pyrone synthase encoding gene from Gerbera hybrida (Gh2PS). The rate-limiting step of TAL synthesis was removed by introducing a mutant gene for acetyl-CoA carboxylase from S. cerevisiae (ScACC1*) and increasing the copy number of Gh2PS. Additionally, the phosphoketolase/phosphotransacetylase pathway (PK pathway) was introduced to enhance intracellular acetyl-CoA supply.
Triacetic acid lactone (TAL) is a promising renewable platform polyketide with broad biotechnological applications. In this study, we constructed an engineered Pichia pastoris strain for the production of TAL. We first introduced a heterologous TAL biosynthetic pathway by integrating the 2-pyrone synthase encoding gene from Gerbera hybrida (Gh2PS). We then removed the rate-limiting step of TAL synthesis by introducing the posttranslational regulation-free acetyl-CoA carboxylase mutant encoding gene from S. cerevisiae (ScACC1*) and increasing the copy number of Gh2PS. Finally, to enhance intracellular acetyl-CoA supply, we focused on the introduction of the phosphoketolase/phosphotransacetylase pathway (PK pathway). To direct more carbon flux towards the PK pathway for acetyl-CoA generation, we combined it with a heterologous xylose utilization pathway or endogenous methanol utilization pathway. The combination of the PK pathway with the xylose utilization pathway resulted in the production of 825.6 mg/L TAL in minimal medium with xylose as the sole carbon source, with a TAL yield of 0.041 g/g xylose. This is the first report on TAL biosynthesis in P. pastoris and its direct synthesis from methanol. The present study suggests potential applications in improving the intracellular pool of acetyl-CoA and provides a basis for the construction of efficient cell factories for the production of acetyl-CoA derived compounds.
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