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Title: Activity screening of environmental metagenomic libraries reveals novel carboxylesterase families

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep44103· OSTI ID:1393927
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  1. Univ. of Toronto, ON (Canada). Dept. of Chemical Engineering and Applied Chemistry
  2. Bangor Univ., Gwynedd (United Kingdom). School of Biological Sciences
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Midwest Center for Structural Genomics, Structural Biology Center
  4. Univ. of Evry Val d'Essonne (UEVE) (France). National Center of Scientific Research (CNRS)
  5. Univ. of Evry Val d'Essonne (UEVE) (France). National Center for Scientific Research (CNRS)
  6. Inst. for Coastal Marine Environment, Messina (Italy)
  7. Spanish National Research Council (CSIC), Madrid (Spain). Inst. of Catalysis

Metagenomics has made accessible an enormous reserve of global biochemical diversity. In order to tap into this vast resource of novel enzymes, we have screened over one million clones from metagenome DNA libraries derived from sixteen different environments for carboxylesterase activity and identified 714 positive hits. Here, we validated the esterase activity of 80 selected genes, which belong to 17 different protein families including unknown and cyclase-like proteins. Three metagenomic enzymes exhibited lipase activity, and seven proteins showed polyester depolymerization activity against polylactic acid and polycaprolactone. Detailed biochemical characterization of four new enzymes revealed their substrate preference, whereas their catalytic residues were identified using site-directed mutagenesis. The crystal structure of the metal-ion dependent esterase MGS0169 from the amidohydrolase superfamily revealed a novel active site with a bound unknown ligand. Thus, activity-centered metagenomics has revealed diverse enzymes and novel families of microbial carboxylesterases, whose activity could not have been predicted using bioinformatics tools.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Genome Canada; Ontario Genomics Institute; Ontario Research Fund; Natural Sciences and Engineering Research Council of Canada (NSERC); Spanish Ministerio de Economia y Competitividad (MINECO); German Federal Ministry of Education and Research (BMBF); Biotechnology and Biological Sciences Research Council (BBSRC); European Regional Development Fund (ERDF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1393927
Journal Information:
Scientific Reports, Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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