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Microbial hosts for production of their monomeric precursors such as glutarate are developed. To meet the market demand, production hosts have to be improved constantly with respect to product titers and yields, but also shortening bioprocess duration is important.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>In this study, adaptive laboratory evolution was used to improve a <jats:italic>C. glutamicum<\/jats:italic> strain engineered for production of the C<jats:sub>5<\/jats:sub>-dicarboxylic acid glutarate by flux enforcement. Deletion of the <jats:sc>l<\/jats:sc>-glutamic acid dehydrogenase gene <jats:italic>gdh<\/jats:italic> coupled growth to glutarate production since two transaminases in the glutarate pathway are crucial for nitrogen assimilation. The hypothesis that strains selected for faster glutarate-coupled growth by adaptive laboratory evolution show improved glutarate production was tested. A serial dilution growth experiment allowed isolating faster growing mutants with growth rates increasing from 0.10\u00a0h<jats:sup>\u22121<\/jats:sup> by the parental strain to 0.17\u00a0h<jats:sup>\u22121<\/jats:sup> by the fastest mutant. Indeed, the fastest growing mutant produced glutarate with a twofold higher volumetric productivity of 0.18\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup>\u00a0h<jats:sup>\u22121<\/jats:sup> than the parental strain. Genome sequencing of the evolved strain revealed candidate mutations for improved production. Reverse genetic engineering revealed that an amino acid exchange in the large subunit of <jats:sc>l<\/jats:sc>-glutamic acid-2-oxoglutarate aminotransferase was causal for accelerated glutarate production and its beneficial effect was dependent on flux enforcement due to deletion of <jats:italic>gdh<\/jats:italic>. Performance of the evolved mutant was stable at the 2\u00a0L bioreactor-scale operated in batch and fed-batch mode in a mineral salts medium and reached a titer of 22.7\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup>, a yield of 0.23\u00a0g\u00a0g<jats:sup>\u22121<\/jats:sup> and a volumetric productivity of 0.35\u00a0g\u00a0L<jats:sup>\u22121<\/jats:sup>\u00a0h<jats:sup>\u22121<\/jats:sup>. Reactive extraction of glutarate directly from the fermentation broth was optimized leading to yields of 58% and 99% in the reactive extraction and reactive re-extraction step, respectively. The fermentation medium was adapted according to the downstream processing results.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Flux enforcement to couple growth to operation of a product biosynthesis pathway provides a basis to select strains growing and producing faster by adaptive laboratory evolution. After identifying candidate mutations by genome sequencing causal mutations can be identified by reverse genetics. As exemplified here for glutarate production by <jats:italic>C. glutamicum<\/jats:italic>, this approach allowed deducing rational metabolic engineering strategies.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12934-021-01586-3","type":"journal-article","created":{"date-parts":[[2021,5,10]],"date-time":"2021-05-10T13:18:52Z","timestamp":1620652732000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Adaptive laboratory evolution accelerated glutarate production by Corynebacterium glutamicum"],"prefix":"10.1186","volume":"20","author":[{"given":"Carina","family":"Prell","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Busche","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"R\u00fcckert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lea","family":"Nolte","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Brandenbusch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3473-0012","authenticated-orcid":false,"given":"Volker F.","family":"Wendisch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,5,10]]},"reference":[{"key":"1586_CR1","unstructured":"European Bioplastics e.V. 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