Paper Title:
Regulation of the Arsenic Oxidation Encoding Genes of a Moderately Acidophilic, Facultative Chemolithoautotrophic Thiomonas sp.
  Abstract

At the abandoned mining site of Carnoulès (Gard, France), weathering of the arsenopyrite rich tailings leads to the formation of acidic effluents heavily loaded with arsenite (As(III)). However, further downstream, the As(III) concentration decreases while the sediments are richer in arsenate (As(V)). A Thiomonas sp. able to oxidize arsenite to arsenate has been isolated and characterized. The aoxA and aoxB genes encoding the two subunits of this enzyme belong to an operon. Analysis of the genome sequence (Genoscope, Ivry, France) shows that this operon encodes also two cytochromes c, which could be the physiological partners of the arsenite oxidase, and a transcriptional regulator belonging to the metalloregulator ArsR/SmtB family, which could control the expression of the aox operon. The expression of this operon is higher in the presence than in the absence of As(III) and appears also to be repressed in the presence of thiosulfate, a more energetic substrate.

  Info
Periodical
Advanced Materials Research (Volumes 20-21)
Edited by
Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
Pages
427-430
DOI
10.4028/www.scientific.net/AMR.20-21.427
Citation
D. Slyemi, J. Ratouchniak, V. Bonnefoy, "Regulation of the Arsenic Oxidation Encoding Genes of a Moderately Acidophilic, Facultative Chemolithoautotrophic Thiomonas sp.", Advanced Materials Research, Vols. 20-21, pp. 427-430, 2007
Online since
July 2007
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