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      Sequencing and transcriptional analysis of the chlorite dismutase gene of Dechloromonas agitata and its use as a metabolic probe.

      Applied and Environmental Microbiology

      Sequence Homology, Amino Acid, Transcription, Genetic, enzymology, Betaproteobacteria, genetics, growth & development, Blotting, Northern, Cloning, Molecular, Molecular Sequence Data, Oxidoreductases, Phylogeny, Sequence Analysis, DNA, Amino Acid Sequence, Base Sequence

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          The dismutation of chlorite into chloride and O(2) represents a central step in the reductive pathway of perchlorate that is common to all dissimilatory perchlorate-reducing bacteria and is mediated by a single enzyme, chlorite dismutase. The chlorite dismutase gene cld was isolated and sequenced from the perchlorate-reducing bacterium Dechloromonas agitata strain CKB. Sequence analysis identified an open reading frame of 834 bp that would encode a mature protein with an N-terminal sequence identical to that of the previously purified D. agitata chlorite dismutase enzyme. The predicted translation product of the D. agitata cld gene is a protein of 277 amino acids (aa), including a leader peptide of 26 aa. Primer extension analysis identified a single transcription start site directly downstream of an AT-rich region that could represent the -10 promoter region of the D. agitata cld gene. Northern blot analysis indicated that the cld gene was transcriptionally up-regulated when D. agitata cells were grown in perchlorate-reducing versus aerobic conditions. Slot blot hybridizations with a D. agitata cld probe demonstrated the conservation of the cld gene among perchlorate-reducing bacteria. This study represents the first description of a functional gene associated with microbial perchlorate reduction.

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