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Development of an enzyme activity screening system for β-glucosidase-displaying yeasts using calcium alginate micro-beads and flow sorting

Abstract

Recent reports on high-speed affinity screening systems for yeast cells using flow cytometry have not been adapted to screening yeast cells that display hydrolyzing enzymes, since the fluorescent molecules which are released from fluoresceinated substrate diffuse into solution after enzymatic reaction. In this research, yeast cells displaying β-glycosidase were individually captured in micro-sized calcium alginate beads by using the newly developed reverse micelle method to prevent diffusion of hydrolyzed fluorescent substrates. By adopting flow sorting to these captured cells, active cells were successfully enriched about 82-fold from a mixed suspension with negative controls. This system should be a useful method for high-speed screening of yeast cells that display various hydrolyzing enzymes and has potential application to screening randomized libraries of enzyme-displayed yeast cells with higher activities.

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Correspondence to Kiichi Fukui.

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Zhou, Y., Kajiyama, S., Itoh, K. et al. Development of an enzyme activity screening system for β-glucosidase-displaying yeasts using calcium alginate micro-beads and flow sorting. Appl Microbiol Biotechnol 84, 375–382 (2009). https://doi.org/10.1007/s00253-009-2091-8

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Keywords

  • Yeast cell surface display
  • β-glucosidase
  • Screening system
  • Calcium alginate beads