Journal
BIORESOURCE TECHNOLOGY
Volume 169, Issue -, Pages 181-187Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.06.093
Keywords
Cell surface display; Ice nucleation protein (INP); Triphenylmethane reductase (TMR); Dye degradation
Funding
- National Natural Science Foundation of China [31200599, 41271335]
- China Postdoctoral Science Foundation [2012M521163]
- Excellent Postdoctoral Science Foundation of Zhejiang Province [Bsh1202087]
- High Technology Research and Development Program of China (863 Program) [2012AA06A203]
- National Key Technology R and D Program [2012BAC17B04]
- Science and Technology Project of Zhejiang Province [2011C13016, 2013C3303, 2014C33019]
- Environmental Science Project of Zhejiang Province [2012B006]
- Social Development of Science and Technology Project of West Lake District
- Science and Technology Development Plan of Hangzhou City [20130533B36]
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Traditional biological treatment for triphenylmethane dye effluent is stuck with the inaccessibility of dye molecules to intracellular dye-degrading enzyme, thus a high-efficiency and low-cost method for dye decolorization is highly desirable. Here we established a bioremediation approach to display triphenylmethane reductase (TMR) on the surface of Escherichia coli (E. coli) using N-terminal of ice nucleation protein as anchoring motif for triphenylmethane dye decolorization for the first time. Approximately 85% of recombinant protein positioning on the surface of E. coli cells exhibited high activity and stability. The optimal temperature and pH of the surface-displayed TMR are 50 degrees C and 8.5, respectively. Comparing with other reported microorganisms, the decolorization rate for malachite green of this engineered strain is the highest so far, reaching 640 lmol min(-1) g(-1) dry weight cells. These results indicate that this engineered E. coli strain is a very promising candidate for synthetic dye removal. (C) 2014 Elsevier Ltd. All rights reserved.
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