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Related Concept Videos

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...

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Related Experiment Video

Updated: Jun 19, 2026

Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor
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A High-Sensitivity Genetically Encoded Biosensor for Terephthalic Acid Detection in PET Degradation.

Seok Jin Oh1,2, Jung-Ung An1,3, Jun-Hong Park1,2

  • 1Synthetic Biology Research Center and the K-Biofoundry, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea.

ACS Synthetic Biology
|August 15, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a genetically encoded biosensor for terephthalic acid (TPA) to rapidly screen polyethylene terephthalate (PET)-degrading enzymes. This biosensor accelerates the discovery of enzymes crucial for plastic recycling and the circular bioeconomy.

Keywords:
PETaseTPA transporterTphR transcription factorgenetically encoded biosensorsynthetic biologyterephthalate detection

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Synthetic Biology

Background:

  • Polyethylene terephthalate (PET) waste accumulation presents a significant environmental challenge due to its recalcitrance.
  • Enzymatic hydrolysis of PET is a promising sustainable degradation method.
  • Current high-throughput screening tools for PET-degrading enzymes are limited.

Purpose of the Study:

  • To develop a genetically encoded biosensor (GEB) for rapid and sensitive detection of terephthalic acid (TPA), a key PET degradation product.
  • To engineer an efficient biosensor system in *Escherichia coli* for enhanced TPA detection.
  • To establish a scalable platform for identifying and optimizing PET-degrading enzymes.

Main Methods:

  • Engineered a TphR-based biosensor in *Escherichia coli* by combining an optimized transcriptional system with diverse TPA uptake transporters.
  • Optimized intracellular TPA accumulation through transporter selection and genetic component tuning.
  • Validated the biosensor's performance using various PETases and compared results with High-Performance Liquid Chromatography (HPLC) assays.

Main Results:

  • Achieved a detection limit of 1 μM TPA, representing a 1,000-fold sensitivity improvement over the initial design.
  • The best-performing biosensor configuration demonstrated enhanced signal intensity and a broader detection range.
  • Successfully distinguished between different PETase variants based on their hydrolytic activity.

Conclusions:

  • The developed GEB provides a rapid, scalable, and ultrasensitive platform for monitoring PET hydrolysis.
  • This biosensor serves as a robust, low-cost alternative to conventional analytical methods.
  • The engineered biosensor accelerates the discovery and optimization of enzymes for PET upcycling and circular bioeconomy applications.