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High-throughput Protein Expression Generator Using a Microfluidic Platform
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A high-throughput expression and screening platform for applications-driven PETase engineering.

Hannah S Zurier1, Julie M Goddard1

  • 1Department of Food Science and Technology, Cornell University, Ithaca, New York, USA.

Biotechnology and Bioengineering
|December 27, 2022
PubMed
Summary
This summary is machine-generated.

Scientists engineered a more efficient PETase enzyme to break down plastic waste. This new platform accelerates the discovery of plastic-degrading enzymes for industrial applications.

Keywords:
PETaseenzyme engineeringhigh-throughput screeningmicroplasticsplastic degradationsemi-rational design

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Enzymology

Background:

  • Plastic pollution poses a significant environmental threat, impacting ecosystems globally.
  • Microbes have evolved to degrade synthetic polymers, with PETase being a key enzyme for polyester hydrolysis.
  • Current PETase engineering is limited by low-throughput protein purification and activity detection methods.

Purpose of the Study:

  • To develop a high-throughput platform for engineering PETase enzymes.
  • To overcome limitations in current protein purification and activity screening techniques.
  • To enhance PETase stability and activity for industrial plastic depolymerization.

Main Methods:

  • Developed a secretory expression system using YebF tagging to bypass cell lysis and purification.
  • Implemented fluorescent detection of degradation products for rapid screening of depolymerase activity in microplates.
  • Utilized semi-rational engineering to create novel PETase variants.

Main Results:

  • The new platform enables high-throughput production and screening of large PETase mutant libraries.
  • Developed a semi-rational PETase (SR-PETase) variant with enhanced stability and activity.
  • SR-PETase demonstrated 1.9-fold higher degradation product release and up to 7.4-fold increased activity compared to wild-type PETase over 10 days at 40°C.

Conclusions:

  • The developed high-throughput platform significantly advances PETase engineering capabilities.
  • The novel SR-PETase variant shows promise for efficient industrial-scale plastic waste depolymerization.
  • This approach can be adapted for screening PETase mutants under various application-relevant conditions, accelerating enzyme evolution for bioremediation.