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Issue 31, 2014
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A unique fluorescence response of hexaphenylsilole to methyl parathion hydrolase: a new signal generating system for the enzyme label

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Abstract

Methyl parathion hydrolase (MPH), an enzyme that catalyses the turnover of methyl parathion (MP) to p-nitrophenol (pNP), can be utilized as an enzyme label. In this paper, a unique fluorescence response of 1,1-bis[4-(diethylaminomethyl)phenyl]-2,3,4,5-tetraphenylsilole (A2HPS) to MPH whose gene was obtained from Pseudomonas sp. strain WBC-3 is described. In the absence of MP, A2HPS could only give a small fluorescence response to the enzyme (I/I0 = 1.1). The detection must be performed under low pH conditions, and the influence of BSA and hemoglobin (Hb) was high; upon addition of the enzyme's substrate, 1 × 10−5 μg mL−1 or 2.85 × 10−13 M of the MPH could be reported by A2HPS with a higher I/I0 of 1.7. The detection limit was 105 times more sensitive than that given by a spectrophotometric method. In addition, the assay could be performed at a near neutral pH which was more biocompatible, and little influence was observed from BSA and Hb. The light-on response to the MPH was due to the different quenching effect of the MP and pNP on A2HPS and the improvement in the detection selectivity was due to combining the enzyme reaction with the detection. The findings of this work suggested that A2HPS and MP could form a new reporter system for the MPH enzyme label.

Graphical abstract: A unique fluorescence response of hexaphenylsilole to methyl parathion hydrolase: a new signal generating system for the enzyme label

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Publication details

The article was received on 20 Apr 2014, accepted on 09 Jun 2014 and first published on 09 Jun 2014


Article type: Paper
DOI: 10.1039/C4TB00624K
J. Mater. Chem. B, 2014,2, 5093-5099

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    A unique fluorescence response of hexaphenylsilole to methyl parathion hydrolase: a new signal generating system for the enzyme label

    G. N. Zhao, B. Tang, Y. Q. Dong, W. H. Xie and B. Z. Tang, J. Mater. Chem. B, 2014, 2, 5093
    DOI: 10.1039/C4TB00624K

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