title: [A new aerobic gram-positive bacterium with a unique ability to degrade ortho- and para-chlorinated biphenyls].
abstract: Strain B51 capable of degrading polychlorinated biphenyls (PCB) was isolated from soil contaminated with wastes from the chemical industry. Based on its morphological and chemotaxonomic characteristics, the strain was identified as a Microbacterium sp. Experiments with washed cells showed that strain B51 is able to degrade ortho- and para-substituted mono-, di-, and trichlorinated biphenyls (MCB, DCB, and TCB, respectively). Unlike the known PCB degraders, Microbacterium sp. B51 is able to oxidize the ortho-chlorinated ring of 2,2'-DCB and 2,4'-DCB and the para-chlorinated ring of 4.4'-DCB. The degradation of 2,4'-DCB and 4,4'-DCB was associated with the accumulation of 4-chlorobenzoic acid (4-CBA) in the medium in amounts comprising 80-90% of the theoretical yield. The strain was able to utilize 2-MCB, 2,2'-DCB, and their intermediate 2-CBA and to oxidize the mono(ortho)-chlorinated ring of 2,4,2'-TCB and the di(ortho-para)-chlorinated ring of 2,4,4'-TCB. A mixed culture of Microbacterium sp. B51 and the 4-CBA-degrading bacterium Arthrobacter sp. H15 was found to grow well on 1 g/l 2,4'-DCB as the sole source of carbon and energy.
authors.affiliation: Institute of Ecology and Genetics of Microorganisms, Ural Division Russian Academy of Sciences, ul. Goleva 13, Perm, 614081 Russia.
authors.forename: D O
authors.initials: DO
authors.lastname: Rybkina
authors.forename: E G
authors.initials: EG
authors.lastname: Plotnikova
authors.forename: L V
authors.initials: LV
authors.lastname: Dorofeeva
authors.forename: Iu L
authors.initials: IuL
authors.lastname: Mironenko
authors.forename: V A
authors.initials: VA
authors.lastname: Demakov
mesh_terms: D001673:Biodegradation, Environmental; D002723:Chlorobenzoates / Q000737:chemistry / Q000378:metabolism; D006088:Gram-Negative Aerobic Bacteria / Q000145:classification / Q000302:isolation & purification / Q000378:metabolism*; D011078:Polychlorinated Biphenyls / Q000737:chemistry / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis
chemical_list: D002723:Chlorobenzoates; D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls; C040768:4-chlorobenzoic acid