Abstract
A 14-kilobase-pair (kbp) EcoRI DNA fragment that encodes an enzyme capable of rapid hydrolysis of N-methylcarbamate insecticides (carbofuran hydrolase) was cloned from carbofuran-degrading Achromobacter sp. strain WM111. When used to probe Southern blots containing plasmid and total DNAs from WM111, this 14-kbp fragment hybridized strongly to a 14-kbp EcoRI fragment from the greater than 100-kbp plasmid harbored by this strain but weakly to EcoRI-digested total DNA from Achromobacter sp. strain WM111, indicating that the gene for N-methylcarbamate degradation (mcd) is plasmid encoded. Further subcloning localized the mcd gene on a 3-kbp ScaI-ClaI fragment. There was little or no expression of this gene in the alternative gram-negative hosts Pseudomonas putida, Alcaligenes eutrophus, Acinetobacter calcoaceticus, and Achromobacter pestifer. Western blotting (immunoblotting) of the protein products produced by low-level expression in P. putida confirmed that this 3-kbp fragment encodes the two 70+-kilodalton protein products seen in sodium dodecyl sulfate-polyacrylamide gel electrophoresis of purified carbofuran hydrolase.
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Selected References
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