{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T13:59:52Z","timestamp":1792245592695,"version":"4.4.0"},"reference-count":48,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2008,6,4]],"date-time":"2008-06-04T00:00:00Z","timestamp":1212537600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biotech &amp; Bioengineering"],"published-print":{"date-parts":[[2008,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Derivatives of <jats:italic>Escherichia coli<\/jats:italic> C were previously described for succinate production by combining the deletion of genes that disrupt fermentation pathways for alternative products (<jats:italic>ldhA::FRT, adhE::FRT, ackA::FRT, focA\u2010pflB::FRT, mgsA, poxB<\/jats:italic>) with growth\u2010based selection for increased ATP production. The resulting strain, KJ073, produced 1.2 mol of succinate per mol glucose in mineral salts medium with acetate, malate, and pyruvate as significant co\u2010products. KJ073 has been further improved by removing residual recombinase sites (FRT sites) from the chromosomal regions of gene deletion to create a strain devoid of foreign DNA, strain KJ091(<jats:italic>\u0394ldhA \u0394adhE \u0394ackA \u0394focA\u2010pflB \u0394mgsA \u0394poxB<\/jats:italic>). KJ091 was further engineered for improvements in succinate production. Deletion of the threonine decarboxylase (<jats:italic>tdcD<\/jats:italic>; acetate kinase homologue) and 2\u2010ketobutyrate formate\u2010lyase (<jats:italic>tdcE<\/jats:italic>; pyruvate formate\u2010lyase homologue) reduced the acetate level by 50% and increased succinate yield (1.3 mol\u2009mol<jats:sup>\u22121<\/jats:sup> glucose) by almost 10% as compared to KJ091 and KJ073. Deletion of two genes involved in oxaloacetate metabolism, aspartate aminotransferase (<jats:italic>aspC<\/jats:italic>) and the NAD<jats:sup>+<\/jats:sup>\u2010linked malic enzyme (<jats:italic>sfcA<\/jats:italic>) (KJ122) significantly increased succinate yield (1.5 mol\u2009mol<jats:sup>\u22121<\/jats:sup> glucose), succinate titer (700 mM), and average volumetric productivity (0.9 g\u2009L<jats:sup>\u22121<\/jats:sup>\u2009h<jats:sup>\u22121<\/jats:sup>). Residual pyruvate and acetate were substantially reduced by further deletion of <jats:italic>pta<\/jats:italic> encoding phosphotransacetylase to produce KJ134 (<jats:italic>\u0394ldhA \u0394adhE \u0394focA\u2010pflB \u0394mgsA \u0394poxB \u0394tdcDE \u0394citF \u0394aspC \u0394sfcA \u0394pta\u2010ackA<\/jats:italic>). Strains KJ122 and KJ134 produced near theoretical yields of succinate during simple, anaerobic, batch fermentations using mineral salts medium. Both may be useful as biocatalysts for the commercial production of succinate. Biotechnol. Bioeng. \u00a9 2008 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/bit.22005","type":"journal-article","created":{"date-parts":[[2008,6,4]],"date-time":"2008-06-04T16:54:10Z","timestamp":1212598450000},"page":"881-893","source":"Crossref","is-referenced-by-count":215,"title":["Eliminating side products and increasing succinate yields in engineered strains of <i>Escherichia coli<\/i> 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