Whangsuk W, Thiengmag S, Dubbs J, Mongkolsuk S, Loprasert S. Specific detection of the pesticide chlorpyrifos by a sensitive genetic-based whole cell biosensor.
Anal Biochem 2015;
493:11-3. [PMID:
26452613 DOI:
10.1016/j.ab.2015.09.022]
[Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 09/25/2015] [Accepted: 09/26/2015] [Indexed: 10/22/2022]
Abstract
The Sinorhizobium meliloti chpA promoter is highly induced in the presence of the pesticide chlorpyrifos (CPF) through the action of the transcriptional activator, ChpR. A whole-cell biosensor for the detection of CPF was developed and is composed of an Escherichia coli strain carrying a chpR expression vector and a chpA promoter-atsBA transcriptional fusion plasmid encoding sulfatase (atsA) and formylglycine generating enzyme (atsB) from Klebsiella sp. The sulfatase is posttranslationally activated by formylglycine generating enzyme (FGE) and then converts 4-methylumbelliferyl sulfate (4-MUS) to the fluorescent product, 4-methyllumbelliferone (4-MU). This biosensor system exhibited a linear response range from 25 to 500 nM CPF.
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