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Peschke, Theo; Bitterwolf, Patrick; Gallus, Sabrina; Hu, Yong; Oelschlaeger, Claude; Willenbacher, Norbert; Rabe, Kersten S.; Niemeyer, Christof M.
Angewandte Chemie International Edition, December 21, 2018, Letnik: 57, Številka: 52Journal Article
Continuous flow biocatalysis is an emerging field of industrial biotechnology that uses enzymes immobilized in flow channels for the production of value‐added chemicals. We describe the construction of self‐assembling all‐enzyme hydrogels that are comprised of two tetrameric enzymes. The stereoselective dehydrogenase LbADH and the cofactor‐regenerating glucose 1‐dehydrogenase GDH were genetically fused with a SpyTag or SpyCatcher domain, respectively, to generate two complementary homo‐tetrameric building blocks that polymerize under physiological conditions into porous hydrogels. Mounted in microfluidic reactors, the gels show excellent stereoselectivity with near quantitative conversion in the reduction of prochiral ketones along with high robustness under process and storage conditions. The gels function as compartment that retains intermediates thus enabling high total turnover numbers of the expensive cofactor NADP(H). Hydrogels comprised entirely of enzymes self‐assemble under physiological conditions by covalent SpyTag/SpyCatcher interaction to porous hydrogels. Mounted in microfluidic reactors, the gels exhibit excellent stability, stereoselectivity, and cofactor retention without the need for additional carriers or membranes.
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in: SICRIS
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