TY  - JOUR
AU  - Prodanović, Radivoje
AU  - Lloyd Ung, W.
AU  - Ilić Đurđić, Karla
AU  - Fischer, Rainer
AU  - Weitz, David A.
AU  - Ostafe, Raluca
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3950
AB  - Glucose oxidase (GOx) is an important industrial enzyme that can be optimized for specific applications by mutagenesis and activity.based screening. To increase the efficiency of this approach, we have developed a new ultrahigh.throughput screening platform based on a microfluidic lab.on.chip device that allows the sorting of GOx mutants from a saturation mutagenesis library expressed on the surface of yeast cells. GOx activity was measured by monitoring the fluorescence of water microdroplets dispersed in perfluorinated oil. The signal was generated via a series of coupled enzyme reactions leading to the formation of fluorescein. Using this new method, we were able to enrich the yeast cell population by more than 35.fold for GOx mutants with higher than wild.type activity after two rounds of sorting, almost double the efficiency of our previously described flow cytometry platform. We identified and characterized novel GOx mutants, the most promising of which (M6) contained a combination of six point mutations that increased the catalytic constant kcat by 2.1.fold compared to wild.type GOx and by 1.4.fold compared to a parental GOx variant. The new microfluidic platform for GOx was therefore more sensitive than flow cytometry and supports comprehensive screens of gene libraries containing multiple mutations per gene. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
PB  - MDPI
T2  - Molecules
T1  - A high.throughput screening system based on droplet microfluidics for glucose oxidase gene libraries
VL  - 25
IS  - 10
DO  - 10.3390/molecules25102418
ER  - 

@article{
author = "Prodanović, Radivoje and Lloyd Ung, W. and Ilić Đurđić, Karla and Fischer, Rainer and Weitz, David A. and Ostafe, Raluca",
year = "2020",
abstract = "Glucose oxidase (GOx) is an important industrial enzyme that can be optimized for specific applications by mutagenesis and activity.based screening. To increase the efficiency of this approach, we have developed a new ultrahigh.throughput screening platform based on a microfluidic lab.on.chip device that allows the sorting of GOx mutants from a saturation mutagenesis library expressed on the surface of yeast cells. GOx activity was measured by monitoring the fluorescence of water microdroplets dispersed in perfluorinated oil. The signal was generated via a series of coupled enzyme reactions leading to the formation of fluorescein. Using this new method, we were able to enrich the yeast cell population by more than 35.fold for GOx mutants with higher than wild.type activity after two rounds of sorting, almost double the efficiency of our previously described flow cytometry platform. We identified and characterized novel GOx mutants, the most promising of which (M6) contained a combination of six point mutations that increased the catalytic constant kcat by 2.1.fold compared to wild.type GOx and by 1.4.fold compared to a parental GOx variant. The new microfluidic platform for GOx was therefore more sensitive than flow cytometry and supports comprehensive screens of gene libraries containing multiple mutations per gene. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).",
publisher = "MDPI",
journal = "Molecules",
title = "A high.throughput screening system based on droplet microfluidics for glucose oxidase gene libraries",
volume = "25",
number = "10",
doi = "10.3390/molecules25102418"
}

Prodanović, R., Lloyd Ung, W., Ilić Đurđić, K., Fischer, R., Weitz, D. A.,& Ostafe, R.. (2020). A high.throughput screening system based on droplet microfluidics for glucose oxidase gene libraries. in Molecules
MDPI., 25(10).
https://doi.org/10.3390/molecules25102418

Prodanović R, Lloyd Ung W, Ilić Đurđić K, Fischer R, Weitz DA, Ostafe R. A high.throughput screening system based on droplet microfluidics for glucose oxidase gene libraries. in Molecules. 2020;25(10).
doi:10.3390/molecules25102418 .

Prodanović, Radivoje, Lloyd Ung, W., Ilić Đurđić, Karla, Fischer, Rainer, Weitz, David A., Ostafe, Raluca, "A high.throughput screening system based on droplet microfluidics for glucose oxidase gene libraries" in Molecules, 25, no. 10 (2020),
https://doi.org/10.3390/molecules25102418 . .