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Applied and Environmental Microbiology, August 2006, p. 5486-5491, Vol. 72, No. 8
0099-2240/06/$08.00+0     doi:10.1128/AEM.00855-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Temporal Expression of Respiratory Genes in an Enrichment Culture Containing Dehalococcoides ethenogenes

Brian G. Rahm,1 Robert M. Morris,1,2 and Ruth E. Richardson1*

Department of Civil and Environmental Engineering, 220 Hollister Hall, Cornell University, Ithaca, New York 14853,1 Department of Microbiology, Wing Hall, Cornell University, Ithaca, New York 148532

Received 11 April 2006/ Accepted 16 June 2006

Multiple reductive dehalogenase (RDase), hydrogenase (H2ase), and other respiration-associated (RA) oxidoreductase genes have been identified in cultured representatives of Dehalococcoides. Although their products are likely to play key roles in the environmentally important process of reductive dechlorination, very little information is available about their regulation and specific functions. Here we show increased expression and temporal variability in the expression of five RDase genes and in the expression of genes for a putative formate dehydrogenase (Fdh) and two H2ases, including a periplasmic [Ni/Fe] H2ase (Hup) and a cytoplasmic [Fe] H2ase (Vhu). mRNA transcripts extracted from tetrachloroethene-dechlorinating mixed cultures corresponding to Fdh, the H2ase Hup, and the RDase targets TceA and DET0162 were expressed most highly, with average levels 34 (± 7.5)-, 23 (± 6.7)-, 16 (± 3.3)-, and 13 (± 3.3)-fold higher, respectively, than that for RNA polymerase (RpoB). H2ase and RA transcripts reached their respective expression maxima within the first 2 h after feeding. RDase transcripts, however, were most highly expressed after 3 h and exhibited greater temporal variability than other transcripts. Comparison with D. ethenogenes strain 195 pure culture expression levels indicated that RDase DET1545 was more highly expressed in mixed cultures, where, on average, its transcript level was sixfold higher than that of RpoB. While the specific functions of several of these gene products remain elusive, the high expression levels and temporal variability reported here suggest that these groups of enzymes are metabolically important for the respiration of chlorinated ethenes in mixed cultures containing Dehalococcoides.

* Corresponding author. Mailing address: Department of Civil and Environmental Engineering, 220 Hollister Hall, Cornell University, Ithaca, NY 14853. Phone: (607) 255-3233. Fax: (607) 255-9004. E-mail: rer26{at}cornell.edu.

Applied and Environmental Microbiology, August 2006, p. 5486-5491, Vol. 72, No. 8
0099-2240/06/$08.00+0     doi:10.1128/AEM.00855-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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