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Microbial Dehalorespiration with 1,1,1-Trichloroethane
Baolin Sun,1Benjamin M. Griffin,12Héctor L. Ayala-del-Río,12Syed A. Hashsham,13James M. Tiedje12*
1,1,1-Trichloroethane (TCA) is a ubiquitous environmental
pollutant because of its widespread use as an industrial solvent,its
improper disposal, and its substantial emission to the atmosphere.We
report the isolation of an anaerobic bacterium, strain TCA1,that
reductively dechlorinates TCA to 1,1-dichloroethane and
chloroethane.Strain TCA1 required H2 as an electron donor
and TCA as an electronacceptor for growth, indicating that
dechlorination is a respiratoryprocess. Phylogenetic analysis
indicated that strain TCA1 is relatedto gram-positive bacteria with
low DNA G+C content and that itsclosest relative is Dehalobacter
restrictus, an obligate H2-oxidizing,chloroethene-respiring bacterium.
1 Center for Microbial Ecology,
2 Department of Microbiology and Molecular Genetics,
3 Department of Civil and Environmental Engineering,
Michigan State University, East Lansing, MI 48824-1325, USA.
*
To whom correspondence should be addressed. E-mail:
tiedjej{at}msu.edu
