Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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CRISPR-Driven Genome Engineering for Chorismate- and Anthranilate-Accumulating Corynebacterium Cell Factories

  • Hye-Jin Kim (Department of Biological Sciences and Bioengineering, Inha University) ;
  • Si-Sun Choi (Department of Biological Sciences and Bioengineering, Inha University) ;
  • Eung-Soo Kim (Department of Biological Sciences and Bioengineering, Inha University)
  • Received : 2023.05.28
  • Accepted : 2023.06.26
  • Published : 2023.10.28
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Abstract

In this study, we aimed to enhance the accumulation of chorismate (CHR) and anthranilate (ANT), key intermediates in the shikimate pathway, by modifying a shikimate over-producing recombinant strain of Corynebacterium glutamicum [19]. To achieve this, we utilized a CRISPR-driven genome engineering approach to compensate for the deletion of shikimate kinase (AroK) as well as ANT synthases (TrpEG) and ANT phosphoribosyltransferase (TrpD). In addition, we inhibited the CHR metabolic pathway to induce CHR accumulation. Further, to optimize the shikimate pathway, we overexpressed feedback inhibition-resistant Escherichia coli AroG and AroH genes, as well as C. glutamicum AroF and AroB genes. We also overexpressed QsuC and substituted shikimate dehydrogenase (AroE). In parallel, we optimized the carbon metabolism pathway by deleting the gntR family transcriptional regulator (IolR) and overexpressing polyphosphate/ATP-dependent glucokinase (PpgK) and glucose kinase (Glk). Moreover, acetate kinase (Ack) and phosphotransacetylase (Pta) were eliminated. Through our CRISPR-driven genome re-design approach, we successfully generated C. glutamicum cell factories capable of producing up to 0.48 g/l and 0.9 g/l of CHR and ANT in 1.3 ml miniature culture systems, respectively. These findings highlight the efficacy of our rational cell factory design strategy in C. glutamicum, which provides a robust platform technology for developing high-producing strains that synthesize valuable aromatic compounds, particularly those derived from the shikimate pathway metabolites.

Keywords

Acknowledgement

This work was funded by the National Research Foundation of Korea (Project No. NRF-2021R1A2C2012203). This work was also carried out with the support of the "Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01563901)" of the Rural Development Administration.

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