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CRISPR-assisted rational flux-tuning and arrayed CRISPRi screening of an l-proline exporter for l-proline hyperproduction
Development of hyperproducing strains is important for biomanufacturing of biochemicals and biofuels but requires extensive efforts to engineer cellular metabolism and discover functional components. Herein, we optimize and use the CRISPR-assisted editing and CRISPRi screening methods to convert a w...
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Published in: | Nature communications 2022-02, Vol.13 (1), p.891-891, Article 891 |
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Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Development of hyperproducing strains is important for biomanufacturing of biochemicals and biofuels but requires extensive efforts to engineer cellular metabolism and discover functional components. Herein, we optimize and use the CRISPR-assisted editing and CRISPRi screening methods to convert a wild-type
Corynebacterium glutamicum
to a hyperproducer of
l
-proline, an amino acid with medicine, feed, and food applications. To facilitate
l
-proline production, feedback-deregulated variants of key biosynthetic enzyme γ-glutamyl kinase are screened using CRISPR-assisted single-stranded DNA recombineering. To increase the carbon flux towards
l
-proline biosynthesis, flux-control genes predicted by in silico analysis are fine-tuned using tailored promoter libraries. Finally, an arrayed CRISPRi library targeting all 397 transporters is constructed to discover an
l
-proline exporter Cgl2622. The final plasmid-, antibiotic-, and inducer-free strain produces
l
-proline at the level of 142.4 g/L, 2.90 g/L/h, and 0.31 g/g. The CRISPR-assisted strain development strategy can be used for engineering industrial-strength strains for efficient biomanufacturing.
Corynebacterium glutamicum
is a major workhorse in industrial biomanufacturing of amino acids. Here, the authors employ CRISPR-assisted rational flux-tuning and CRISPRi screening of a L-proline exporter to covert a wild-type C. glutamicum to a hyperproducer of L-proline. |
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ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/s41467-022-28501-7 |