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. 1997 May;63(5):2054–2057. doi: 10.1128/aem.63.5.2054-2057.1997

Biodegradation of 2,4-Dichlorophenol through a Distal meta-Fission Pathway

S Koh, M V Mccullar, D D Focht
PMCID: PMC1389167  PMID: 16535612

Abstract

Alcaligenes eutrophus JMP222, a derivative of A. eutrophus JMP134 which has lost plasmid pJP4 (encoding the tfd genes for the ortho fission pathway), was induced for the meta fission pathway when grown on o-cresol. Resting cell suspensions, grown on o-cresol, oxidized 2,4-dichlorophenol (2,4-DCP), a degradation product of 2,4-dichlorophenoxyacetic acid, to 3,5-dichlorocatechol. Further degradation of 3,5-dichlorocatechol was observed by the production of a yellow ring fission product with liberation of chloride. Oxidation of 2,4-DCP (305 (mu)M) in 47 hs resulted in 69% dehalogenation through this pathway. The ring fission product was characterized as 2-hydroxy-3,5-dichloro-6-oxo-hexa-2,4-dienoic acid by gas chromatography-mass spectrometry and gas chromatography-Fourier transform infrared spectroscopy. These data indicate that 2,4-DCP is degraded through a distal meta ring fission pathway, in contrast to either a suicidal proximal fission or the standard ortho fission pathway.

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Selected References

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