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Appl. Environ. Microbiol., Mar 1996, 761-765, Vol 62, No. 3
PK Sharma and PL McCarty
A rapidly-growing facultatively aerobic bacterium that transforms
tetrachloroethene (PCE) via trichloroethene (TCE) to cis-1,2-dichloroethene
(cis-1,2-DCE) at high rates in a defined medium was isolated from a
contaminated site. Metabolic characterization, cellular fatty acid
analysis, and partial sequence analysis of 16S rRNA showed that the new
isolate, strain MS-1, has characteristics matching those of the members of
the family Enterobacteriaceae. Strain MS-1 can oxidize about 58 substrates
including many carbohydrates, short-chain fatty acids, amino acids,
purines, and pyrimidines. It can transform up to 1 mM PCE (aqueous) at a
rate of about 0.5 (mu)mol of PCE(middot) h(sup-1)(middot)mg (dry weight) of
cell(sup-1). PCE transformation occurs following growth on or with the
addition of single carbon sources such as glucose, pyruvate, formate,
lactate, or acetate or with complex nutrient sources such as yeast extract
or a mixture of amino acids. PCE dehalogenation requires the absence of
oxygen, nitrate, and high concentrations of fermentable compounds such as
glucose. Enterobacter agglomerans biogroup 5 (ATCC 27993), a known
facultative bacterium that is closely related to strain MS-1, also
reductively dehalogenated PCE to cis-1,2-DCE. To our knowledge, this is the
first report on isolation of a facultative bacterium that can reductively
transform PCE to cis-1,2-DCE under defined physiological conditions. Also,
this is the first report of the ability of E. agglomerans to dehalogenate
PCE.
Copyright © 1996, American Society for Microbiology
Isolation and Characterization of a Facultatively Aerobic Bacterium That Reductively Dehalogenates Tetrachloroethene to cis-1,2-Dichloroethene
Western Region Hazardous Substance Research Center, Department of Civil Engineering, Stanford University, Stanford, California 94305-4020
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