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Improving key enzyme activity in phenylpropanoid pathway with a designed biosensor.

Dandan Xiong1, Shikun Lu1, Jieyuan Wu1

  • 1CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Metabolic Engineering
|January 24, 2017
PubMed
Summary
This summary is machine-generated.

Researchers engineered a biosensor to screen for improved p-coumarate: CoA ligase (4CL) activity. This led to a 4CL variant that enhanced the production of valuable natural products like resveratrol and naringenin.

Keywords:
BiosensorHigh-throughput screeningPhenylpropanoids pathwayProtein engineeringResveratrolp-Coumarate:coenzyme A ligase

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Area of Science:

  • Metabolic Engineering
  • Synthetic Biology
  • Biotechnology

Background:

  • Overexpressing enzymes for product overproduction can burden cells.
  • Improving key enzyme activity is crucial for efficient biosynthesis.
  • p-Coumarate: CoA ligase (4CL) is vital in the phenylpropanoid pathway for natural product synthesis.

Purpose of the Study:

  • To develop a biosensor for screening 4CL variants with enhanced activity.
  • To identify and characterize a hyperactive 4CL mutant.
  • To demonstrate the utility of biosensors in improving biosynthetic pathways.

Main Methods:

  • Engineered a TtgR regulatory protein to create a resveratrol biosensor.
  • Constructed a 4CL mutagenesis library in an *Escherichia coli* system.
  • Selected and validated a 4CL variant with improved enzymatic activity.

Main Results:

  • Developed a specific and robust biosensor for resveratrol hyper-producers.
  • Identified a 4CL variant exhibiting significantly improved activity.
  • Demonstrated increased production of resveratrol and naringenin using the selected 4CL mutant.

Conclusions:

  • Designed biosensors are effective tools for selecting improved enzymes in biosynthetic pathways.
  • Enhancing key enzyme activity can overcome metabolic burdens and boost product yields.
  • This approach is applicable to improving the synthesis of various value-added natural products.