Journal
CHEMICAL ENGINEERING JOURNAL
Volume 287, Issue -, Pages 568-574Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.11.087
Keywords
Organophosphorus hydrolase; Biocatalyst; Oleosin; Oleosome; Paraoxon; Biodegradation
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Funding
- Ministry of Science and Technology of Taiwan [NSC 101-2218-E-011-046-MY3, MOST 104-2221-E-011-009]
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Engineering enzymes with higher activities, stabilities and reusabilities has been constantly pursued for applications of enzymatic catalysis in industrial, pharmaceutical and environmental processes. We report here a novel approach to prepare efficient biocatalysts in vivo for enhanced degradation of organophosphate nerve agents. Organophosphorus hydrolase (OPH) was genetically fused with oleosins to form oleosome-based biocatalysts. Quick purification of intact OPH-associated oleosomes can be achieved by using a flotation centrifugation method due to the high triacyiglycerol (TAG) content in the oleosomes, making it easy for further protein recovery and reuse. The newly developed biocatalysts exhibited a 5-fold increase in the degradation rate against paraoxon compared to free OPH. In addition, the thermal stability and solvent tolerance were also enhanced remarkably. More importantly, the resulting biocatalysts remained intact and active even after repeated recycling, suggesting their potential use for bio-catalytic decontamination of organophosphate neurotoxins. (C) 2015 Elsevier B.V. All rights reserved.
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