Abstract
Pathway engineering is a useful technology for producing desired compounds on a large scale by modifying the biosynthetic pathways of host organisms using genetic engineering. We focused on acetoacetate esters as novel low-cost substrates and established an efficient terpenoid production system using pathway-engineered recombinant Escherichia coli. Functional analysis using recombinant E. coli proteins of 18 carboxylesterases identified from the microbial esterases and lipases database showed that the p-nitrobenzyl esterase (PnbA) from Bacillus subtilis specifically hydrolyzed two acetoacetate esters: methyl acetoacetate (MAA) and ethyl acetoacetate (EAA). We generated a plasmid (pAC-Mev/Scidi/Aacl/PnbA) co-expressing PnbA and six enzymes of the mevalonate pathway gene cluster from Streptomyces, isopentenyl diphosphate isomerase type I from Saccharomyces cerevisiae, and acetoacetyl-coenzyme A ligase from Rattus norvegicus. The plasmid pAC-Mev/Scidi/Aacl/PnbA was introduced into E. coli along with plasmid expressing carotenoid (lycopene) or sesquiterpene (β-bisabolene) biosynthesis genes, and the terpenoid production was evaluated following the addition of acetoacetate esters as substrates. These recombinant E. coli strains used MAA and EAA as substrates for the biosynthesis of terpenoids and produced almost equivalent concentrations of target compounds compared with the previous production system that used mevalonolactone and lithium acetoacetate. The findings of this study will enable the production of useful terpenoids from low-cost substrates, which may facilitate their commercial production on an industrial scale in the future.
Key points
• PnbA from Bacillus subtilis exhibits acetoacetate hydrolysis activity.
• A plasmid enabling terpenoid synthesis from acetoacetate esters was constructed.
• Acetoacetate esters as substrates enable a low-cost production of terpenoids.
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The data that support the findings of this study are available at reasonable request to the corresponding author.
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Acknowledgements
We thank Prof. Norihiko Misawa (Ishikawa Prefectural University) for kindly providing the pCRT-EIB and pET-ZoTPS1 plasmids. We also thank KNC Laboratories Co., Ltd. (Kobe, Japan), for providing lithium acetoacetate.
Funding
This research was supported by grant aid from the commission for Development of Artificial Gene Synthesis Technology for Creating Innovative Biomaterial from the Ministry of Economy, Trade and Industry (METI), Japan.
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HH and DS conceived and designed the study. All authors conducted the experiments. HH and DS analyzed experimental data. HH wrote the manuscript. All authors read and approved the manuscript.
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Harada, H., Senda, D., Shima, T. et al. Carboxylesterases for the hydrolysis of acetoacetate esters and their applications in terpenoid production using Escherichia coli. Appl Microbiol Biotechnol 105, 5821–5832 (2021). https://doi.org/10.1007/s00253-021-11447-z
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DOI: https://doi.org/10.1007/s00253-021-11447-z