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Appl. Environ. Microbiol., 10 1996, 3800-3808, Vol 62, No. 10
RA Sanford, JR Cole, FE Loffler and JM Tiedje
Strain Co23, an anaerobic spore-forming microorganism, was enriched and
isolated from a compost soil on the basis of its ability to grow with
2,3-dichlorophenol (DCP) as its electron acceptor, ortho chlorines were
removed from polysubstituted phenols but not from monohalophenols. Growth
by chlororespiration was indicated by a growth yield of 3.24 g of cells per
mol of reducing equivalents (as 2[H]) from lactate oxidation to acetate in
the presence of 3-chloro-4-hydroxybenzoate but no growth in the absence of
the halogenated electron acceptor. Other indicators of chlororespiration
were the fraction of electrons from the electron donor used for
dechlorination (0.67) and the H2 threshold concentration of < 1.0 ppm.
Additional electron donors utilized for reductive dehalogenation were
pyruvate, formate, butyrate, crotonate, and H2. Pyruvate supported
homoacetogenic growth in the absence of an electron acceptor. Strain Co23
also used sulfite, thiosulfate, and sulfur as electron acceptors for
growth, but it did not use sulfate, nitrate or fumarate. The temperature
optimum for growth was 37 degrees C; however, the rates of dechlorination
were optimum at 45 degrees C and activity persisted to temperatures as high
as 55 degrees C. The 16S rRNA sequence was determined, and strain Co23 was
found to be related to Desulfitobacterium dehalogenans JW/IU DC1 and
Desulfitobacterium strain PCE1, with sequence similarities of 97.2 and
96.8%, respectively. The phylogenetic and physiological properties
exhibited by strain Co23 place it into a new species designated
Desulfitobacterium chlororespirans.
Copyright © 1996, American Society for Microbiology
Characterization of Desulfitobacterium chlororespirans sp. nov., which grows by coupling the oxidation of lactate to the reductive dechlorination of 3-chloro-4-hydroxybenzoate
Center for Microbial Ecology, Michigan State University, East Lansing 48824-1325, USA.
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