Abstract
The stereo-specific l-isoleucine-4-hydroxylase (l-isoleucine dioxygenase (IDO)) was cloned and expressed in an Escherichia coli 2Δ strain lacking the activities of α-ketoglutarate dehydrogenase (EC 1.2.4.2), isocitrate liase (EC 4.1.3.1), and isocitrate dehydrogenase kinase/phosphatase (EC 2.7.11.5). The 2Δ strain could not grow in a minimal-salt/glucose/glycerol medium due to the blockage of TCA during succinate synthesis. The IDO activity in the 2Δ strain was able to “shunt” destroyed TCA, thereby coupling l-isoleucine hydroxylation and cell growth. Using this strain, we performed the direct biotransformation of l-isoleucine into 4-HIL with an 82% yield.
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Smirnov, S.V., Kodera, T., Samsonova, N.N. et al. Metabolic engineering of Escherichia coli to produce (2S, 3R, 4S)-4-hydroxyisoleucine. Appl Microbiol Biotechnol 88, 719–726 (2010). https://doi.org/10.1007/s00253-010-2772-3
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DOI: https://doi.org/10.1007/s00253-010-2772-3