Biodegradation of diphenyl ether and its monohalogenated derivatives by Sphingomonas sp. strain SS3

Article Abstract:

Sphingomonas sp. strain SS3, with the ability to metabolize diphenyl ether (DE) and its 4-fluoro, 4-chloro and 4-bromo derivatives, was isolated from soil samples from an industrial waste deposit. The bacterium was enriched and characterized. The results showed that SS3 could cometabolize the monohalogenated DEs, resulting in the production of phenol and catechol as intermediates. These were then channeled through the 3-oxoadipate pathway. In general, the degradation steps showed characteristics of the 1,2-dioxygenation system, which in this bacterium, apparently acts nonspecifically.

Biodegradation, Ethers, Ethers (Class of compounds)

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Metabolism of dibenzo-p-dioxin by Sphingomonas sp. strain RW1

Article Abstract:

A bacterium, identified asSphigomonas sp. strain RW1, with the ability to mineralize dibenzo-para-dioxins(DD) and dibenzofuran (DF), was isolated from enrichment cultures inoculated with water samples from the river Elbe. The proposed pathway for degradation ofthe biaryl ethers begins with ring cleavage of the substrate at the angular position adjacent to the ether bridge. The resulting 2,2',3-trihyroxy compoundsare meta cleaved, with the resulting catechol undergoing both ortho and meta cleavage.

Bioremediation

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Metabolism of hydroxydibenzofurans, methoxydibenzofurans, acetoxydibenzofurans, and nitrodibenzofurans by Sphingomonas sp. strain HH69

Article Abstract:

A study of 11 substituted dibenzofurans by the Sphingomonas sp. strain which is dibenzofuran-degrading indicates high regioselectivity of these monosubstituted dibenzofurans for the ether bond cleavage with the preference for the nonsubstituted aromatic nucleus. The HH69 strain developed on 2-methoxydibenzofurans after getting adapted to the utilization of 5-methoxysalicyclic acid. Hydrolysis of ester bonds stimulates the degradation of acetoxydibenzofurans.

Analysis

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