Tuning the binding affinity of heme-responsive biosensor for precise and dynamic pathway regulation
Tuning the binding affinity of heme-responsive biosensor for precise and dynamic pathway regulation
复制标题
调整血红素响应生物传感器的结合亲和力以实现精确和动态的通路调节
DOI:
10.1016/j.isci.2020.101067
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发表时间:
2020-04
期刊:
影响因子:
5.8
通讯作者:
Qian Wang
中科院分区:
文献类型:
--
作者:
Jian Zhang;Zhiguo Wang;Tianyuan Su;Huanhuan Sun;Yuan Zhu;Qingsheng Qi;Qian Wang
Current challenge for dynamic pathway control in metabolic engineering is enabling the components of the artificial regulatory system to be tunable. Here, we designed and built a heme-responsive regulatory system containing a heme biosensor HrtR and CRISPRi to regulate chemicals production while maintaining the intracellular heme homeostasis. A series of engineered biosensors with varied sensitivity and threshold were obtained by semi-rational design with site saturated mutation of HrtR. The modified metabolite-binding affinity of HrtR was confirmed by heme titration and molecular dynamic simulation. Dynamic regulation pattern of the system was validated by the fluctuation of gene expression and intracellular heme concentration. The efficiency of this regulatory system was proved by improving the 5-aminolevulinic acid (ALA) production to 5.35g/L, the highest yield in batch fermentation ofEscherichia coli. This system was also successfully used in improving porphobilinogen (PBG) and porphyrins biosynthesis and can be applied in many other biological processes.
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影响因子:
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