From Eat to trEat: Engineering the mitochondrial Eat1 enzyme for enhanced ethyl acetate production in Escherichia coli

Aleksander J. Kruis, Anna C. Bohnenkamp*, Bram Nap, Jochem Nielsen, Astrid E. Mars, Rene H. Wijffels, John Van Der Oost, Servé W.M. Kengen, Ruud A. Weusthuis*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Background: Genetic engineering of microorganisms has become a common practice to establish microbial cell factories for a wide range of compounds. Ethyl acetate is an industrial solvent that is used in several applications, mainly as a biodegradable organic solvent with low toxicity. While ethyl acetate is produced by several natural yeast species, the main mechanism of production has remained elusive until the discovery of Eat1 in Wickerhamomyces anomalus. Unlike other yeast alcohol acetyl transferases (AATs), Eat1 is located in the yeast mitochondria, suggesting that the coding sequence contains a mitochondrial pre-sequence. For expression in prokaryotic hosts such as E. coli, expression of heterologous proteins with eukaryotic signal sequences may not be optimal. Results: Unprocessed and synthetically truncated eat1 variants of Kluyveromyces marxianus and Wickerhamomyces anomalus have been compared in vitro regarding enzyme activity and stability. While the specific activity remained unaffected, half-life improved for several truncated variants. The same variants showed better performance regarding ethyl acetate production when expressed in E. coli. Conclusion: By analysing and predicting the N-terminal pre-sequences of different Eat1 proteins and systematically trimming them, the stability of the enzymes in vitro could be improved, leading to an overall improvement of in vivo ethyl acetate production in E. coli. Truncated variants of eat1 could therefore benefit future engineering approaches towards efficient ethyl acetate production.

Original languageEnglish
Article number76
JournalBiotechnology for Biofuels
Volume13
Issue number1
DOIs
Publication statusPublished - 19 Apr 2020

Keywords

  • Alcohol acetyl transferase (AAT)
  • Eat1
  • Escherichia coli
  • Ethyl acetate
  • Mitochondria

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