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High-Throughput Screening of Acyl-CoA Thioesterase I Mutants Using a Fluid Array Platform.

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High-throughput screening identified novel Escherichia coli thioesterase mutants for enhanced free fatty acid production. This fluid array platform advances synthetic biology and metabolic engineering applications.

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Microbiology

Background:

  • Screening microorganisms from mutated recombinant libraries is vital for synthetic biology and metabolic engineering.
  • Conventional screening methods face limitations in throughput, cost, and labor.

Purpose of the Study:

  • To develop and utilize a high-throughput screening (HTS) method for identifying Escherichia coli thioesterase mutants with elevated free fatty acid (FFA) production.
  • To overcome the limitations of traditional screening tools in terms of speed, cost, and manual effort.

Main Methods:

  • Employed a fluid array platform for HTS of a large (10^6) mutant library of Escherichia coli.
  • Utilized a growth-based screening method with a TetA-RFP fusion sensing mechanism.
  • Incorporated a reporter-based screening method to identify high-level FFA producers.
  • Performed post-analysis using gas chromatography for FFA quantification.

Main Results:

  • Successfully screened over 95% of the mutation library using the fluid array platform.
  • Identified specific 'TesA thioesterase mutations in Escherichia coli that significantly enhance free fatty acid production.
  • Confirmed the elevated FFA production capability of the isolated mutants.

Conclusions:

  • The fluid array platform enables efficient HTS for identifying beneficial microbial mutants in metabolic engineering.
  • The identified 'TesA mutations offer a promising avenue for improving free fatty acid yields in Escherichia coli.
  • This approach accelerates the development of microbial cell factories for sustainable chemical production.