Abstract
A bacterial strain able to degrade dichloromethane (DCM) as the sole carbon source was isolated from a wastewater treatment plant receiving domestic and pharmaceutical effluent. 16S rDNA studies revealed the strain to be a Xanthobacter sp. (strain TM1). The new isolated strain when grown aerobically on DCM showed Luong type growth kinetics, with μmax of 0.094 h−1 and S m of 1,435 mg l−1. Strain TM1 was able to degrade other aromatic and aliphatic halogenated compounds, such as halobenzoates, 2-chloroethanol and dichloroethane. The gene for DCM dehalogenase, which is the key enzyme in DCM degradation, was amplified through PCR reactions. Strain TM1 contains type A DCM dehalogenase (dcmAa), while no product could be obtained for type B dehalogense (dcmAb). The sequence was compared against 12 dcmAa from other DCM degrading strains and 98% or 99% similarity was observed with all other previously isolated DCM dehalogenase genes. This is the first time a Xanthobacter sp. is reported to degrade DCM.
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Acknowledgements
This work was supported in part by the European Community’s Human Potential Programme under contract HP-RTH-CT-2002-00213 (BIOSAP). R. Ferreira Jorge would like to thank financial support from Fundação para a Ciência e Tecnologia (SFRH/BPD/18716/2004).
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Emanuelsson, M.A.E., Osuna, M.B., Ferreira Jorge, R.M. et al. Isolation of a Xanthobacter sp. degrading dichloromethane and characterization of the gene involved in the degradation. Biodegradation 20, 235–244 (2009). https://doi.org/10.1007/s10532-008-9216-0
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DOI: https://doi.org/10.1007/s10532-008-9216-0