Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 51, Issue 1, Pages 175-181Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b03705
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Funding
- Bogazici University Scientific Research Projects Fund [BAP 7130]
- EU Research Executive Agency FP7-PEOPLE-MC-CIG [ROBO-DAR-293665]
- Scientific and Technological Research Council of Turkey (TUBITAK) [113Y528, BIDEB 2214a]
- Division Of Environmental Biology
- Direct For Biological Sciences [1241046] Funding Source: National Science Foundation
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Recently, an array of eight genes involved in the biotransformation of benzalkonium chlorides (BACs)-an active ingredient of many disinfectants to benzyldimethyl amine (BDMA) was identified in the genome of Pseudomonas:sp. BIOMIG1, which is a bacterium present in various environments and mineralizes BACs. In this study, we showed that heterologous expression of an oxygenase gene (oxyBAC) present in this gene array in E. coli resulted in formation of BDMA from BACs at a rate of 14 mu M h(-1). oxyBAC is phylogenetically classified as a Rieske-type oxygenase (RO) and belongs to a group which catalyzes the cleavage of C-N+ bond between either methyl or alkyl ester and a quaternary nitrogen (N) of natural quaternary ammonium compounds such as stachydrine, carnitine, and trimethylglycine: Insertion of two glycines into the Rieske domain and substitution of tyrosine with leucine, in the mononuclear iron center differentiate oxyBAC from other ROs that cleave C-N+, and presumably facilitate the cleavage of saturated alkyl chain from quaternary N via N-dealkylation reaction. In addition, unlike other ROs, oxyBAC did pot require a specific reductase to function. Our results demonstrate that oxyBAC represents a new member of RO associated with BAC degradation, and have applications for controlling the fate of BACs in the environment.
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