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A new approach for discovering cold-active enzymes in a cell mixture of pure-cultured bacteria

Cited 3 time in wos
Cited 5 time in scopus
Title
A new approach for discovering cold-active enzymes in a cell mixture of pure-cultured bacteria
Authors
Kim, Dockyu
Park, Ha Ju
Kim, Il-Chan
Yim, Joung Han
Subject
Biotechnology & Applied Microbiology
Keywords
Activity-based enzyme screenChitinaseCold-activeCulture mixtureFunctional expressionMetagenomic libraryPseudoalteromonas issachenkonii
Issue Date
2014
Citation
Kim, Dockyu, et al. 2014. "A new approach for discovering cold-active enzymes in a cell mixture of pure-cultured bacteria". Biotechnology Letters, 36(3): 567-573.
Abstract
To overcome the intrinsic problems of conventional approaches, such as the unavailability of source microorganisms in metagenomic libraries and the production of inactive aggregates, a new method was tested for discovering new enzymes (e.g. coldactive chitinase). A metagenome-like library was constructed using genomes extracted from a cell mixture of pure-cultured chitinolytic bacteria, followed by activity-based screening for Escherichia coli clones that exhibit chitinase activity on selective medium. Within one positive chitinolytic clone, one chitinase gene (chi22718_III) was detected and assigned to the arctic marine bacterium, Pseudoalteromonas issachenkonii PAMC 22718, by colony-PCR with chi22718_III-specific primers. When expressed in E. coli, recombinant R-Chi22718_III lost 85 % of its enzyme activity when pre-incubated at 40 ℃ for 1 h, whereas its mesophilic counterpart R-ChiK only lost 10 % of its activity under the same conditions indicating that R-Chi22718_III is thermolabile, a characteristic of cold-active enzymes.
DOI
http://dx.doi.org/10.1007/s10529-013-1384-2
Type
Article
Appears in Collections  
2011-2016, Exploration of Future Resources in The Polar Oceans and Study on Their Utilization (K-POD) (11-16) / Yim; Joung Han (PM11090; PM12030; PM13030; PM14050; PM15050)
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