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Title 

Strategy for screening metagenomic resources for exocellulase activity using a robotic, high-throughput screening system

Authors 

Kyongcheol KoYun Jon HanDae-Eun CheongJong Hyun ChoiJae Jun Song

Publisher 

Elsevier

Issue Date 

2013

Citation 

Journal of Microbiological Methods, vol. 94, no. 3, pp. 311-316

Keywords 

Enzyme assayExocellulaseHigh-throughput screening (HTS)Metagenome

Abstract 

Exocellulases play a key role in cleaving the accessible ends of cellulose molecules to release soluble glucose and cellobiose. To date, there have been no screens for exocellulase owing to assay protocol limitations, the high cost of substrates, and low activity of exocellulases compared with endocellulases. This study is the first to demonstrate direct screening for exocellulase activity using a robotic, high-throughput screening (HTS) system. Cell growth in 96-well plates was measured by monitoring optical density over 11-14h at 37°C with agitation. Fluorescence of methylumbelliferyl groups released from 4-methylumbelliferyl-β-D-cellobioside was determined using a VICTOR3 microplate reader. This new HTS system enabled activity verification of more than 104 clones per day. As a result, we obtained four exocellulases clones (CelEx-SF301, CelEx-SF309, CelEx-BR12 and CelEx-BR15) from 29,006 metagenomic fosmid clones that had previously been prepared from sweet potato field soil microbes and rumen fluid. This powerful approach could be effectively applied to screen various metagenomic resources for new enzymes.

ISSN 

0167-7012

Link 

http://dx.doi.org/10.1016/j.mimet.2013.07.010

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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