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A Myo-Inositol-Inducible Expression System for Corynebacterium glutamicum and Its Application.


ABSTRACT: Corynebacterium glutamicum is one of the important industrial microorganisms for production of amino acids and other value-added compounds. Most expression vectors used in C. glutamicum are based on inducible promoter (P tac or P trc ) activated by isopropyl-β-D-thiogalactopyranoside (IPTG). However, these vectors seem unsuitable for large-scale industrial production due to the high cost and toxicity of IPTG. Myo-inositol is an ideal inducer because of its non-toxicity and lower price. In this study, a myo-inositol-inducible expression vector pMI-4, derived from the expression vector pXMJ19, was constructed. Besides the original chloramphenicol resistance gene cat, multiple cloning sites, and rrnB terminator, the pMI-4 (6,643 bp) contains the iolR q cassette and the myo-inositol-inducible promoter P iolT1 . The pMI-4 could stably replicate in the C. glutamicum host. Meanwhile, the non-myo-inositol degradation host strain C. glutamicumΔiolGΔoxiCΔoxiDΔoxiE for maintaining the pMI-4 was developed. Overexpression of hemA M and hemL using pMI-4 resulted in a significant accumulation of 5-aminolevulinic acid, indicating its potential application in metabolic engineering and industrial fermentation.

SUBMITTER: Lu N 

PROVIDER: S-EPMC8634428 | biostudies-literature |

REPOSITORIES: biostudies-literature

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