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Applied Microbiology and Biotechnology

, Volume 97, Issue 11, pp 5089–5096 | Cite as

Priority pollutant degradation by the facultative methanotroph, Methylocystis strain SB2

  • Sheeja Jagadevan
  • Jeremy D. SemrauEmail author
Environmental Biotechnology

Abstract

Methylocystis strain SB2, a facultative methanotroph capable of growth on multi-carbon compounds, was screened for its ability to degrade the priority pollutants 1,2-dichloroethane (1,2-DCA), 1,1,2-trichloroethane (1,1,2-TCA), and 1,1-dichloroethylene (1,1-DCE), as well as cis-dichloroethylene (cis-DCE) when grown on methane or ethanol. Methylocystis strain SB2 degraded 1,2-DCA and 1,1,2-TCA when grown on either substrate and cis-DCE when grown on methane. Growth of Methylocystis strain SB2 on methane was inhibited in the presence of all compounds, while only 1,1-DCE and cis-DCE inhibited growth on ethanol. No degradation of any chlorinated hydrocarbon was observed in ethanol-grown cultures when particulate methane monooxygenase (pMMO) activity was inhibited with the addition of acetylene, indicating that competition for binding to the pMMO between the chlorinated hydrocarbons and methane limited both methanotrophic growth and pollutant degradation when this strain was grown on methane. Characterization of Methylocystis strain SB2 found no evidence of a high-affinity form of pMMO for methane, nor could this strain utilize 1,2-DCA or its putative oxidative products 2-chloroethanol or chloroactetic acid as sole growth substrates, suggesting that this strain lacks appropriate dehydrogenases for the conversion of 1,2-DCA to glyoxylate. As ethanol: (1) can be used as an alternative growth substrate for promoting pollutant degradation by Methylocystis strain SB2 as the pMMO is not required for its growth on ethanol and (2) has been used to enhance the mobility of chlorinated hydrocarbons in situ, it is proposed that ethanol can be used to enhance both pollutant transport and biodegradation by Methylocystis strain SB2.

Keywords

Facultative methanotrophy Methylocystis strain SB2 Chlorinated alkanes and alkenes Biodegradation 

Notes

Acknowledgments

This research was supported by the Office of Science (BER) US Department of Energy. We dedicate this manuscript to the memory of Professor Sir Howard Dalton, FRS (1944–2008) on the 30th anniversary of his construction of the definition of co-metabolism.

Supplementary material

253_2012_4310_MOESM1_ESM.pdf (270 kb)
ESM 1 (PDF 270 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringThe University of MichiganAnn ArborUSA

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