Noh MH, Lim HG, Moon D, Park S, Jung GY. Auxotrophic Selection Strategy for Improved Production of Coenzyme B
12 in Escherichia coli.
iScience 2020;
23:100890. [PMID:
32086013 PMCID:
PMC7033360 DOI:
10.1016/j.isci.2020.100890]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/17/2020] [Accepted: 02/03/2020] [Indexed: 02/02/2023] Open
Abstract
The production of coenzyme B12 using well-characterized microorganisms, such as Escherichia coli, has recently attracted considerable attention to meet growing demands of coenzyme B12 in various applications. In the present study, we designed an auxotrophic selection strategy and demonstrated the enhanced production of coenzyme B12 using a previously engineered coenzyme B12-producing E. coli strain. To select a high producer, the coenzyme B12-independent methionine synthase (metE) gene was deleted in E. coli, thus limiting its methionine synthesis to only that via coenzyme B12-dependent synthase (encoded by metH). Following the deletion of metE, significantly enhanced production of the specific coenzyme B12 validated the coenzyme B12-dependent auxotrophic growth. Further precise tuning of the auxotrophic system by varying the expression of metH substantially increased the cell biomass and coenzyme B12 production, suggesting that our strategy could be effectively applied to E. coli and other coenzyme B12-producing strains.
The auxotrophic selection strategy was applied to coenzyme B12 production
Coenzyme B12-independent methionine synthase was deleted for auxotroph system
The auxotrophic strategy could significantly enhance the coenzyme B12 production
Optimization of the auxotroph system further enhanced the coenzyme B12 production
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