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  • Title: Strategy for improving L-isoleucine production efficiency in Corynebacterium glutamicum.
    Author: Wang X.
    Journal: Appl Microbiol Biotechnol; 2019 Mar; 103(5):2101-2111. PubMed ID: 30663007.
    Abstract:
    As one of the three branched-chain amino acids essential for human body, L-isoleucine is widely used in food, medicine, and feed industries. At present, L-isoleucine is mainly produced by microbial fermentation, and the main production strain is Corynebacterium glutamicum. The biosynthetic pathway of L-isoleucine in C. glutamicum is complex, and the activity of key enzymes and the transcription of key genes in the pathway are strictly regulated. The intracellularly synthesized L-isoleucine is secreted by transporters, and the activity of the transporters is also regulated. These intricate regulatory mechanisms increase the difficulty to engineer the L-isoleucine-producing C. glutamicum. This article focuses on the mechanism of L-isoleucine biosynthesis, secretion, and regulation in C. glutamicum and reviews the various metabolic engineering strategies for improving L-isoleucine production efficiency in C. glutamicum.
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