Enhanced production of taxadiene in Saccharomyces cerevisiae.

Abstract:

BACKGROUND:Cost-effective production of the highly effective anti-cancer drug, paclitaxel (Taxol®), remains limited despite growing global demands. Low yields of the critical taxadiene precursor remains a key bottleneck in microbial production. In this study, the key challenge of poor taxadiene synthase (TASY) solubility in S. cerevisiae was revealed, and the strains were strategically engineered to relieve this bottleneck. RESULTS:Multi-copy chromosomal integration of TASY harbouring a selection of fusion solubility tags improved taxadiene titres 22-fold, up to 57 ± 3 mg/L at 30 °C at microscale, compared to expressing a single episomal copy of TASY. The scalability of the process was highlighted through achieving similar titres during scale up to 25 mL and 250 mL in shake flask and bioreactor cultivations, respectively at 20 and 30 °C. Maximum taxadiene titres of 129 ± 15 mg/L and 127 mg/L were achieved through shake flask and bioreactor cultivations, respectively, of the optimal strain at a reduced temperature of 20 °C. CONCLUSIONS:The results of this study highlight the benefit of employing a combination of molecular biology and bioprocess tools during synthetic pathway development, with which TASY activity was successfully improved by 6.5-fold compared to the highest literature titre in S. cerevisiae cell factories.

journal_name

Microb Cell Fact

journal_title

Microbial cell factories

authors

Nowrouzi B,Li RA,Walls LE,d'Espaux L,Malcı K,Liang L,Jonguitud-Borrego N,Lerma-Escalera AI,Morones-Ramirez JR,Keasling JD,Rios-Solis L

doi

10.1186/s12934-020-01458-2

subject

Has Abstract

pub_date

2020-11-02 00:00:00

pages

200

issue

1

issn

1475-2859

pii

10.1186/s12934-020-01458-2

journal_volume

19

pub_type

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