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Bioprocess."],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The bioconversion of 4-hydroxy-2-keto acid derivatives via aldol condensation of formaldehyde and pyruvate has received substantial attention as potential source of chemicals for production of amino acids, hydroxy carboxylic acids, and chiral aldehydes.  We developed an environmentally friendly biocatalyst consisting of a novel thermostable class II pyruvate aldolase from <jats:italic>Deinococcus radiodurans<\/jats:italic> with maltose-binding protein (MBP-DrADL), which has specific activity of 46.3 \u00b5mol\u00a0min<jats:sup>\u20131<\/jats:sup>\u00a0mg<jats:sup>\u20131<\/jats:sup>. Surprisingly, MBP-DrADL maintained over 60% of enzyme activity for 4\u00a0days at 50 to 65\u00a0\u00b0C, we used MBP-DrADL as the best candidate enzyme to produce 2-keto-4-hydroxybutyrate (2-KHB) from formaldehyde and pyruvate via aldol condensation. The optimum reaction conditions for 2-KHB production were 50\u00a0\u00b0C, pH 8.0, 5\u00a0mM Mg<jats:sup>2+<\/jats:sup>, 100\u00a0mM formaldehyde, and 200\u00a0mM pyruvate. Under these optimized conditions, MBP-DrADL produced 76.5\u00a0mM (8.94\u00a0g L<jats:sup>\u20131<\/jats:sup>) 2-KHB over 60\u00a0min with a volumetric productivity of 8.94\u00a0g L<jats:sup>\u20131<\/jats:sup>\u00a0h<jats:sup>\u20131<\/jats:sup> and a specific productivity of 357.6\u00a0mg\u00a0mg-enzyme<jats:sup>\u20131<\/jats:sup>\u00a0h<jats:sup>\u20131<\/jats:sup>. Furthermore, 2-KHB production was improved by continuous addition of substrates, which produced approximately 124.8\u00a0mM (14.6\u00a0g L<jats:sup>\u20131<\/jats:sup>) of 2-KHB over 60\u00a0min with a volumetric productivity and specific productivity of 14.6\u00a0g L<jats:sup>\u20131<\/jats:sup>\u00a0h<jats:sup>\u20131<\/jats:sup> and 583.4\u00a0mg\u00a0mg-enzyme<jats:sup>\u20131<\/jats:sup>\u00a0h<jats:sup>\u20131<\/jats:sup>, respectively. MBP-DrADL showed the highest specific productivity for 2-KHB production yet reported. Our study provides a highly efficient biocatalyst for the synthesis of 2-KHB and lays the foundation for large-scale production and application of high-value compounds from formaldehyde.<\/jats:p>\n                <jats:p><jats:bold>Graphical Abstract<\/jats:bold><\/jats:p>","DOI":"10.1186\/s40643-024-00727-x","type":"journal-article","created":{"date-parts":[[2024,1,16]],"date-time":"2024-01-16T09:02:34Z","timestamp":1705395754000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Biotransformation of 2-keto-4-hydroxybutyrate via aldol condensation using an efficient and thermostable carboligase from Deinococcus radiodurans"],"prefix":"10.1186","volume":"11","author":[{"given":"Yeon-Ju","family":"Jeong","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Min-Ju","family":"Seo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bong Hyun","family":"Sung","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeong-Sun","family":"Kim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7307-237X","authenticated-orcid":false,"given":"Soo-Jin","family":"Yeom","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,1,16]]},"reference":[{"issue":"20","key":"727_CR1","doi-asserted-by":"publisher","first-page":"6069","DOI":"10.1093\/nar\/18.20.6069","volume":"18","author":"C Aslanidis","year":"1990","unstructured":"Aslanidis C, de Jong PJ (1990) Ligation-independent cloning of PCR products (LIC-PCR). 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