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A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
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A first continuous 4-aminoantipyrine (4-AAP)-based screening system for directed esterase evolution.

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A new screening system detects esterase activity using phenols and 4-aminoantipyrine. This method identified a variant esterase with improved thermal stability for industrial applications.

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Area of Science:

  • Biocatalysis and Enzyme Engineering
  • Biochemical Assays and Screening

Background:

  • Esterases are crucial industrial enzymes, but current screening methods struggle with complex substrates.
  • Directed evolution requires efficient, high-throughput screening systems for enzyme improvement.

Purpose of the Study:

  • To develop and validate a novel continuous high-throughput screening system for esterolytic activity.
  • To identify esterase variants with enhanced stability and activity for industrial applications.

Main Methods:

  • Developed a continuous screening system (cBLE-4AAP) using phenyl benzoate and 4-aminoantipyrine for phenol detection.
  • Optimized the assay in a 96-well microtiter plate format for sensitivity and linearity.
  • Screened a p-nitrobenzyl esterase (pNBEBL) mutagenesis library for improved thermal activity.

Main Results:

  • The cBLE-4AAP system demonstrated high sensitivity (15 μM LOD) and linearity (15-250 μM) at pH 7.4-10.4.
  • Screening identified a variant T3 (Ser378Pro) with retained activity at room temperature.
  • Variant T3 exhibited a 4.7-fold increase in residual activity after thermal treatment compared to wild-type.

Conclusions:

  • The cBLE-4AAP system is a robust and sensitive tool for esterase screening, particularly for complex substrates.
  • The identified T3 variant shows significant potential for industrial applications requiring thermostable esterases.
  • This work advances directed evolution strategies for enzyme optimization.