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Updated: May 16, 2026

A High Throughput Screen for Biomining Cellulase Activity from Metagenomic Libraries
10:21

A High Throughput Screen for Biomining Cellulase Activity from Metagenomic Libraries

Published on: February 1, 2011

Flow cytometry-based ultra-high-throughput screening assay for cellulase activity.

Raluca Ostafe1, Radivoje Prodanovic, Ulrich Commandeur

  • 1Institute of Molecular Biotechnology, RWTH Aachen University, D-52074 Aachen, Germany.

Analytical Biochemistry
|November 14, 2012
PubMed
Summary

We developed a novel assay using fluorescence-activated cell sorting (FACS) and double emulsion technology to detect cellulase activity. This high-throughput method rapidly enriches cellulase-expressing cells from complex libraries.

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Area of Science:

  • Biotechnology
  • Enzymology
  • Cell Biology

Background:

  • Cellulases are crucial enzymes for biomass degradation.
  • Existing screening methods for cellulase activity lack high throughput.
  • Efficient screening is needed to discover novel cellulase variants.

Purpose of the Study:

  • To develop and validate an ultra-high-throughput screening assay for cellulase activity.
  • To leverage fluorescence-activated cell sorting (FACS) and double emulsion technology for enzyme discovery.
  • To demonstrate the assay's effectiveness in enriching cellulase-expressing cells.

Main Methods:

  • Developed a novel assay utilizing coupled enzymatic reactions with hexose oxidase (HOx).
  • Integrated the assay with fluorescence-activated cell sorting (FACS) and double emulsion technology.
  • Applied the assay to screen high-complexity cellulase clone libraries.

Main Results:

  • Achieved ultra-high-throughput screening of cellulase activity.
  • Demonstrated a 12-fold enrichment of cellulase-expressing cells in a single sorting round.
  • The assay is adaptable to microtiter plate formats and FACS.

Conclusions:

  • The developed FACS-based assay provides an efficient platform for discovering and enriching cellulase variants.
  • This novel method significantly accelerates the screening process for enzymes involved in biomass conversion.
  • The assay's high throughput and sensitivity enable rapid identification of active cellulase clones.