微生物细胞工厂中代谢途径动态调控策略与网络构建

The production of target products in microbial cell factories will face problems such as nutrient consumption, metabolite accumulation, heterologous pathway pressure and genetic instability, leading to metabolic imbalances. Therefore, it is necessary to redesign the metabolic pathway of cells, so that the metabolic pathway can automatically adjust metabolic flux according to the changes of fermentation conditions and other environmental conditions to achieve efficient production. In this review, the classification, regulatory mechanism and application of dynamic regulatory elements are introduced firstly, and the proteinous transcription factor regulatory elements and RNA ribose switch regulatory elements which interact with inducers or inducing factors are mainly described. Then the design and modification strategies of dynamic regulatory elements based on transcription factors and promoter sequences are introduced. Subsequently, strategies for construction of dynamic regulatory network in metabolic pathway using inducible regulatory elements are summarized. The regulation of gene expression has shifted from single-input signal regulation to multi-input signal logic gate regulation, and a more accurate dynamic regulatory network can be constructed through multiple input signal logic gate and closed-loop metabolite feedback loop. The construction of dynamic regulatory network will be significant for construction of most effective microbial cell factories.