Journal
METABOLIC ENGINEERING
Volume 44, Issue -, Pages 253-264Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ymben.2017.10.011
Keywords
Malonyl-CoA; FapR; Biosensors; Fatty acid biosynthesis; Synthetic biology; Genetic circuits; Dynamic regulation
Categories
Funding
- Department of Chemical and Biological Engineering
- ChELSI
- EPSRC [EP/E036252/1]
- University of Sheffield
- CONACYT (Mexico)
- ERASynBio Twinning Program in Synthetic Biology
- Department of Chemical, Biochemical and Environmental Engineering, College of Engineering and Information Technology, Office of the Vice President for Research at the University of Maryland Baltimore County
- Engineering and Physical Sciences Research Council [EP/E036252/1] Funding Source: researchfish
- EPSRC [EP/E036252/1] Funding Source: UKRI
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Malonyl-CoA is the basic building block for synthesizing a range of important compounds including fatty acids, phenylpropanoids, flavonoids and non-ribosomal polyketides. Centering around malonyl-CoA, we summarized here the various metabolic engineering strategies employed recently to regulate and control malonyl-CoA metabolism and improve cellular productivity. Effective metabolic engineering of microorganisms requires the introduction of heterologous pathways and dynamically rerouting metabolic flux towards products of interest. Transcriptional factor-based biosensors translate an internal cellular signal to a transcriptional output and drive the expression of the designed genetic/biomolecular circuits to compensate the activity loss of the engineered biosystem. Recent development of genetically-encoded malonyl-CoA sensor has stood out as a classical example to dynamically reprogram cell metabolism for various biotechnological applications. Here, we reviewed the design principles of constructing a transcriptional factor-based malonyl-CoA sensor with superior detection limit, high sensitivity and broad dynamic range. We discussed various synthetic biology strategies to remove pathway bottleneck and how genetically-encoded metabolite sensor could be deployed to improve pathway efficiency. Particularly, we emphasized that integration of malonyl-CoA sensing capability with biocatalytic function would be critical to engineer efficient microbial cell factory. Biosensors have also advanced beyond its classical function of a sensor actuator for in situ monitoring of intracellular metabolite concentration. Applications of malonyl-CoA biosensors as a sensor-invertor for negative feedback regulation of metabolic flux, a metabolic switch for oscillatory balancing of malonyl-CoA sink pathway and source pathway and a screening tool for engineering more efficient biocatalyst are also presented in this review. We envision the genetically-encoded malonyl-CoA sensor will be an indispensable tool to optimize cell metabolism and cost-competitively manufacture malonyl-CoA-derived compounds.
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