Abstract
4-Hydroxyisoleucine (4-HIL) is a nonproteinogenic amino acid that exhibits insulinotropic biological activity. Here, L-isoleucine dioxygenase gene (ido) derived from Bacillus thuringiensis YBT-1520 was cloned and expressed in an L-isoleucine-producing strain, Corynebacterium glutamicum ssp. lactofermentum SN01, in order to directly convert its endogenous L-isoleucine (Ile) into 4-HIL through single-step fermentation. The effects of corn steep liquor limitation as well as ido and truncated idoΔ6 overexpression on 4-HIL production were researched. 4-HIL production by ido-overexpressing strain was improved to 65.44 ± 2.27 mM after fermented for 144 h under corn steep liquor–subsufficient condition, obviously higher than that under corn steep liquor–rich and insufficient conditions. The conversion ratio of Ile to 4-HIL increased to 0.85 mol/mol. In addition, 4-HIL production by ido-overexpressing strain was higher than that by idoΔ6-overexpressing strain, in accord with the relatively higher affinity of Ido as compared to IdoΔ6. This research generated a novel system for 4-HIL de novo biosynthesis and demonstrated corn steep liquor limitation as a useful strategy for improving 4-HIL production in recombinant C. glutamicum ssp. lactofermentum.
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The authors thank the “Program of State Key Laboratory of Food Science and Technology” (contract no. SKLF-ZZB-201405 and SKLF-ZZB-201501) for financial support.
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Feng Shi and Tengfei Niu contributed equally to this work.
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Shi, F., Niu, T. & Fang, H. 4-Hydroxyisoleucine production of recombinant Corynebacterium glutamicum ssp. lactofermentum under optimal corn steep liquor limitation. Appl Microbiol Biotechnol 99, 3851–3863 (2015). https://doi.org/10.1007/s00253-015-6481-9
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DOI: https://doi.org/10.1007/s00253-015-6481-9