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Isolation of methyl parathion-degrading strain M6 and cloning of the methyl parathion hydrolase gene.

ABSTRACT: A degradative bacterium, M6, was isolated and presumptively identified as Plesiomonas sp. strain M6 was able to hydrolyze methyl parathion to p-nitrophenol. A novel organophosphate hydrolase gene designated mpd was selected from its genomic library prepared by shotgun cloning. The nucleotide sequence of the mpd gene was determined. The gene could be effectively expressed in Escherichia coli.

SUBMITTER: Zhongli C

PROVIDER: S-EPMC93251 | biostudies-literature | 2001 Oct

REPOSITORIES: biostudies-literature

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Isolation of methyl parathion-degrading strain M6 and cloning of the methyl parathion hydrolase gene.

Zhongli C C Shunpeng L L Guoping F F

Applied and environmental microbiology 20011001 10

A degradative bacterium, M6, was isolated and presumptively identified as Plesiomonas sp. strain M6 was able to hydrolyze methyl parathion to p-nitrophenol. A novel organophosphate hydrolase gene designated mpd was selected from its genomic library prepared by shotgun cloning. The nucleotide sequence of the mpd gene was determined. The gene could be effectively expressed in Escherichia coli. ...[more]

PMID: 11571204

Similar Datasets

Probing the mechanisms for the selectivity and promiscuity of methyl parathion hydrolase.

Project description:Diverse organophosphate hydrolases have convergently evolved the ability to hydrolyse man-made organophosphates. Thus, these enzymes are attractive model systems for studying the factors shaping enzyme functional evolution. Methyl parathion hydrolase (MPH) is an enzyme from the metallo-?-lactamase superfamily, which hydrolyses a wide range of organophosphate, aryl ester and lactone substrates. In addition, MPH demonstrates metal-ion-dependent selectivity patterns. The origins of this remain unclear, but are linked to open questions about the more general role of metal ions in functional evolution and divergence within enzyme superfamilies. Here, we present detailed mechanistic studies of the paraoxonase and arylesterase activities of MPH complexed with five different transition metal ions, and demonstrate that the hydrolysis reactions proceed via similar pathways and transition states. However, while it is possible to discern a clear structural origin for the selectivity between different substrates, the selectivity between different metal ions appears to lie instead in the distinct electrostatic properties of the metal ions themselves, which causes subtle changes in transition state geometries and metal-metal distances at the transition state rather than significant structural changes in the active site. While subtle, these differences can be significant for shaping the metal-ion-dependent activity patterns observed for this enzyme.This article is part of the themed issue 'Multiscale modelling at the physics-chemistry-biology interface'.

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Enhanced secretion of a methyl parathion hydrolase in Pichia pastoris using a combinational strategy.

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Isolation of an aryloxyphenoxy propanoate (AOPP) herbicide-degrading strain Rhodococcus ruber JPL-2 and the cloning of a novel carboxylesterase gene (feh).

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Isolation of Oxamyl-degrading Bacteria and Identification of cehA as a Novel Oxamyl Hydrolase Gene.

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Improving the secretion of a methyl parathion hydrolase in Pichia pastoris by modifying its N-terminal sequence.

Project description:Pichia pastoris is commonly used to express and secrete target proteins, although not all recombinant proteins can be successfully produced. In this study, we used methyl parathion hydrolase (MPH) from Ochrobactrum sp. M231 as a model to study the importance of the N-terminus of the protein for its secretion. While MPH can be efficiently expressed intracellularly in P. pastoris, it is not secreted into the extracellular environment. Three MPH mutants (N66-MPH, D10-MPH, and N9-MPH) were constructed through modification of its N-terminus, and the secretion of each by P. pastoris was improved when compared to wild-type MPH. The level of secreted D10-MPH was increased to 0.21 U/mL, while that of N9-MPH was enhanced to 0.16 U/mL. Although N66-MPH was not enzymatically active, it was secreted efficiently, and was identified by SDS-PAGE. These results demonstrate that the secretion of heterologous proteins in P. pastoris may be improved by modifying their N-terminal structures.

| S-EPMC4013123 | biostudies-literature

Blood gene expression of rats exposed to acetaminophen or methyl parathion

Project description:The purpose of this study was to investigate whether expression of specific genes in peripheral blood can be used as surrogate marker(s) to detect and distinguish target organ-specific chemical toxicity in rats. Rats were intraperitoneally administered a single, acute dose of a well-established hepatotoxic (acetaminophen) or neurotoxic (methyl parathion) chemical. Administration of acetaminophen (AP) or methyl parathion (MP) in the rats resulted in hepatotoxicity as evidenced from elevated blood transaminase activities or neurotoxicity as evidenced from the inhibition of acetyl cholinesterase activity in the blood, respectively. Microarray analysis of the global gene expression profile of rat blood identified distinct gene expression markers capable of detecting and distinguishing hepatotoxicity and neurotoxicity induced by AP and MP, respectively. Differential expressions of the marker genes specific for hepatotoxicity and neurotoxicity were detectable in the blood much earlier than the appearance of the commonly used clinical markers, serum transaminases and acetyl cholinesterase. In summary, our results demonstrated that blood gene expression markers can detect and distinguish target organ toxicity non-invasively and with higher sensitivity than traditional surrogate markers. Keywords: blood, acetaminophen, methyl parathion, rat, hepatotoxicity, neurotoxicity

2009-06-01 | GSE13442 | GEO

Cloning and Expression of the Organophosphate Pesticide-Degrading ?-? Hydrolase Gene in Plasmid pMK-07 to Confer Cross-Resistance to Antibiotics.

Project description:Pesticide residual persistence in agriculture soil selectively increases the pesticide-degrading population and transfers the pesticide-degrading gene to other populations, leading to cross-resistance to a wide range of antibiotics. The enzymes that degrade pesticides can also catabolize the antibiotics by inducing changes in the gene or protein structure through induced mutations. The present work focuses on the pesticide-degrading bacteria isolated from an agricultural field that develop cross-resistance to antibiotics. This cross-resistance is developed through catabolic gene clusters present in an extrachromosomal plasmid. A larger plasmid (236.7?Kbp) isolated from Bacillus sp. was sequenced by next-generation sequencing, and important features such as ?-? hydrolase, DNA topoisomerase, DNA polymerase III subunit beta, reverse transcriptase, plasmid replication rep X, recombination U, transposase, and S-formylglutathione hydrolase were found in this plasmid. Among these, the ?-? hydrolase enzyme is known for the degradation of organophosphate pesticides. The cloning and expression of the ?-? hydrolase gene imply nonspecific cleavage of antibiotics through a cross-resistance phenomenon in the host. The docking of ?-? hydrolase with a spectrum of antibiotics showed a high G-score against chloramphenicol (-3.793), streptomycin (-2.865), cefotaxime (-5.885), ampicillin (-4.316), and tetracycline (-3.972). This study concludes that continuous exposure to pesticide residues may lead to the emergence of multidrug-resistant strains among the wild microbial flora.

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Cloning of catechol 2,3-dioxygenase gene and construction of a stable genetically engineered strain for degrading crude oil.

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| S-EPMC3889840 | biostudies-literature

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