Abstract
A gene bank from the chlorinated hydrocarbon-degrading bacterium Xanthobacter autotrophicus GJ10 was prepared in the broad-host-range cosmid vector pLAFR1. By using mutants impaired in dichloroethane utilization and strains lacking dehalogenase activities, several genes involved in 1,2-dichloroethane metabolism were isolated. The haloalkane dehalogenase gene dhlA was subcloned, and it was efficiently expressed from its own constitutive promoter in strains of a Pseudomonas sp., Escherichia coli, and a Xanthobacter sp. at levels up to 30% of the total soluble cellular protein. A 3-kilobase-pair BamHI DNA fragment on which the dhlA gene is localized was sequenced. The haloalkane dehalogenase gene was identified by the known N-terminal amino acid sequence of its product and found to encode a 310-amino-acid protein of molecular weight 35,143. Upstream of the dehalogenase gene, a good ribosome-binding site and two consensus E. coli promoter sequences were present.
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