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Solid-Phase Agar Plate Assay for Screening Amine Transaminases.

Martin S Weiß1, Uwe T Bornscheuer1, Matthias Höhne2

  • 1Department of Biotechnology and Enzyme Catalysis, Institute of Biochemistry, Greifswald University, Felix-Hausdorff-Str. 4, D-17489, Greifswald, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|November 1, 2017
PubMed
Summary
This summary is machine-generated.

Agar plate assays enable high-throughput enzyme screening by directly assaying colonies on membranes. This method efficiently prescreens thousands of enzyme variants weekly, reducing labor and accelerating enzyme discovery.

Keywords:
Agar plate assayDirected evolutionGlycine oxidaseHigh-throughput screening assayHorseradish peroxidaseSolid-phase assayTransaminase

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Area of Science:

  • Biotechnology
  • Enzyme Engineering
  • Molecular Biology

Background:

  • Enzyme libraries generated via methods like error-prone PCR require efficient prescreening.
  • Traditional methods involving cell lysates are labor-intensive and limit throughput.
  • High-throughput screening is crucial for identifying promising enzyme variants.

Purpose of the Study:

  • To present a detailed protocol for screening transaminase libraries using agar plate assays.
  • To demonstrate the efficiency of direct agar plate assays for enzyme variant prescreening.
  • To provide a framework for adapting agar plate assays to various enzymatic activities.

Main Methods:

  • Directly applying colonies expressing enzymes onto adsorbent, microporous membranes.
  • Utilizing agar plate assays for solid-phase enzyme expression and screening.
  • Adapting assay conditions and enzymes for specific screening needs.

Main Results:

  • Agar plate assays allow for the prescreening of 400-800 enzyme variants per membrane.
  • This method enables a single researcher to prescreen 10,000-20,000 variants per week.
  • The protocol facilitates the separation of active, inactive, and neutral enzyme variants efficiently.

Conclusions:

  • Agar plate assays offer a highly efficient and scalable method for prescreening enzyme libraries.
  • This technique significantly reduces screening effort and accelerates the identification of novel enzyme variants.
  • The presented protocol is adaptable for diverse enzymatic activities, fostering broader enzyme discovery.