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. 1988 Sep;170(9):3897–3902. doi: 10.1128/jb.170.9.3897-3902.1988

Isolation and characterization of a new plasmid from a Flavobacterium sp. which carries the genes for degradation of 2,4-dichlorophenoxyacetate.

G R Chaudhry 1, G H Huang 1
PMCID: PMC211387  PMID: 2842290

Abstract

A Flavobacterium sp. (strain 50001), capable of degrading 2,4-dichlorophenoxyacetate (2,4-D), 2-methyl-4-chlorophenoxyacetate, and 2-chlorobenzoate and imparting resistance to mercury, harbored a degradative plasmid, pRC10. Cured strains of the Flavobacterium sp. lost the plasmid as well as the ability to degrade these chlorinated compounds. Comparison of this plasmid with the well-characterized 2,4-D-degradative plasmid pJP4 from Alcaligenes eutrophus showed regions of homology between the two plasmids. Restriction fragments of plasmid pRC10 which shared homology with the regions conferring 2,4-D-degradative genes (tfd) of plasmid pJP4 were cloned into a broad-host-range plasmid and studied in Pseudomonas putida. From the results obtained, the cloned DNA fragment expressed the genes for 2,4-D monooxygenase (tfdA) and 2,4-dichlorophenol hydroxylase (tfdB). In spite of the similarity in function, the size (45 kilobases) and restriction pattern of plasmid pRC10 were considerably different from those of pJP4 (80 kilobases). This may be due to the difference in the microbial background during evolution of the two plasmids.

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Selected References

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