Dechlorination of chlorobenzenes by a culture containing bacterium DF-1, a PCB dechlorinating microorganism.
Polychlorinated benzenes were reductively dechlorinated by an enrichment culture containing the polychlorinated biphenyl (PCB) dechlorinating bacterium DF-1. The culture dechlorinated hexachlorobenzene (hexa-CB) --> pentachlorobenzene (penta-CB) --> 1,2,3,5-tetrachlorobenzene (1,2,3,5-CB) --> 1,3,5-trichlorobenzene (1,3,5-CB) and did not dechlorinate other tetrachlorobenzenes or any trichlorobenzenes. This restricted series of reactions is the most predominant and frequently reported pathway for the dechlorination of hexa-CB and penta-CB by enrichment cultures inoculated with either freshwater or estuarine sediments. The culture did not dechlorinate hydroxylated and methoxylated polychlorinated benzenes or a hydroxylated PCB. Bacterium DF-1 was detected by PCR/DGGE analysis following dechlorination of penta-CB but was not detected when a chlorinated benzene (CB) was not dechlorinated; detection of other members in the communitywas unaffected by the presence or absence of CB dechlorination. This is the first report of a bacterium that reductively dechlorinates both PCBs and CBs and the first identification of an organism that can dechlorinate a CB with more than four chlorines.
Department of Microbiology and Immunology and Medical University of South Carolina, Charleston 29425-2230, USA.
Qingzhong
Q
Wu
Charles E
CE
Milliken
G Patrick
GP
Meier
Joy E M
JE
Watts
Kevin R
KR
Sowers
Harold D
HD
May
D001419:Bacteria; D002713:Chlorine / Q000737:chemistry*; D002722:Chlorobenzenes / Q000378:metabolism*; D004785:Environmental Pollutants / Q000378:metabolism*; D006900:Hydroxylation; D011078:Polychlorinated Biphenyls / Q000378:metabolism
D002722:Chlorobenzenes; D004785:Environmental Pollutants; D002713:Chlorine; D011078:Polychlorinated Biphenyls