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. 1996 Aug;62(8):2716–2722. doi: 10.1128/aem.62.8.2716-2722.1996

Chloroform mineralization by toluene-oxidizing bacteria.

K McClay 1, B G Fox 1, R J Steffan 1
PMCID: PMC168056  PMID: 8702263

Abstract

Seven toluene-oxidizing bacterial strains (Pseudomonas mendocina KR1, Burkholderia cepacia G4, Pseudomonas putida F1, Pseudomonas pickettii PKO1, and Pseudomonas sp. strains ENVPC5, ENVBF1, and ENV113) were tested for their ability to degrade chloroform (CF). The greatest rate of CF oxidation was achieved with strain ENVBF1 (1.9 nmol/min/mg of cell protein). CF also was oxidized by P. mendocina KR1 (0.48 nmol/min/mg of cell protein), strain ENVPC5 (0.49 nmol/min/mg of cell protein), and Escherichia coli DH510B(pRS202), which contained cloned toluene 4-monooxygenase genes from P. mendocina KR1 (0.16 nmol/min/mg of cell protein). Degradation of [14C]CF and ion analysis of culture extracts revealed that CF was mineralized to CO2 (approximately 30 to 57% of the total products), soluble metabolites (approximately 15%), a total carbon fraction irreversibly bound to particulate cellular constituents (approximately 30%), and chloride ions (approximately 75% of the expected yield). CF oxidation by each strain was inhibited in the presence of trichloroethylene, and acetylene significantly inhibited trichloroethylene oxidation by P. mendocina KR1. Differences in the abilities of the CF-oxidizing strains to degrade other halogenated compounds were also identified. CF was not degraded by B. cepacia G4, P. putida F1, P. pickettii PKO1, Pseudomonas sp. strain ENV113, or P. mendocina KRMT, which contains a tmo mutation.

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Selected References

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