Involvement of plasmids in total degradation of chlorinated biphenyls.

Abstract:

:Acinetobacter sp. strain P6 has previously been reported to utilize biphenyl (BP) and chlorinated BPs, with accumulation of corresponding chlorobenzoic acids. Arthrobacter sp. strain M5 was isolated as a contaminant in the culture of Acinetobacter sp. strain P6 growing on 4-chlorobiphenyl and showed properties similar to P6 in the degradation of chlorinated BPs. Both strains harbored an identical plasmid of 53.7 megadaltons. These strains spontaneously lost the ability to utilize BP and 4-chlorobiphenyl with high frequency (4 to 8%) after overnight growth in nutrient broth. The BP- derivatives could not regain the BP-assimilating ability (reversion frequency, less than 10(-9) per cell per generation) but retained the plasmid with small, detectable deletions. BP+ P6 cells grown on BP or benzoate oxidized BP and 2,3-dihydroxybiphenyl and produced meta cleavage compounds from the latter compound (lambda max, 434 nm) and also from catechol (lambda max, 375 nm) through the meta pathway. On the other hand, benzoate-grown BP- segregants totally lost the BP-metabolizing activities and oxidized catechol through the ortho pathway. A combined culture of the chlorinated BP-dissimilating P6 or M5 strain (harboring the putative 53.7-megadalton plasmid specifying conversion of chlorobiphenyls to chlorobenzoic acids) and genetically constructed mono- or dichlorobenzoate-utilizing pseudomonads (harboring plasmids encoding complete utilization of mono- or dichlorobenzoates) allowed greater than 98% utilization of mono- and dichlorobiphenyls, with the liberation of equivalent amounts of chloride ions.

journal_name

Appl Environ Microbiol

authors

Furukawa K,Chakrabarty AM

doi

10.1128/AEM.44.3.619-626.1982

subject

Has Abstract

pub_date

1982-09-01 00:00:00

pages

619-26

issue

3

eissn

0099-2240

issn

1098-5336

journal_volume

44

pub_type

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