Paracoccus thiocyanatus sp. nov., a new species of thiocyanate-utilizing facultative chemolithotroph, and transfer of Thiobacillus versutus to the genus Paracoccus as Paracoccus versutus comb. nov. with emendation of the genus

Article Abstract:

The strain THI 011 super T has been classified into a new species of the genus Paracoccus named Paracoccus thiocyanatus sp. nov. The modified description of the genus Transfer T. versutus of the genus Paracoccus is proposed. The taxonomic and phylogenetic study of THI 011 super T revealed that it utilizes thiocene as the only energy source. Binary sequence comparison showed that strain THI 011 super T is closely associated to Paracoccus aminophilus and T. versutus to Paracoccus denitrificans.

Phylogeny

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Expression of the mau gene cluster of Paracoccus denitrificans is controlled by MauR and a second transcription regulator

Article Abstract:

The genetic mechanisms that promote the induction of the mau operon were analyzed in the gram-negative soil bacterium, Paracoccus denitrificans. Analysis of mau operon expression in Paracoccus denitrificans indicated the role of the MauR LysR-type transcriptional activator in binding with the upstream promoter DNA region of the mau gene cluster. Furthermore, MauR-dependent expression of the mau genes was mediated by the presence of a second activator protein which acts in synergism with MauR.

Genetic aspects, Gram-negative bacteria, Genetic regulation, Microbial enzymes, Genetic transcription, Operons, Transcription (Genetics)

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Reasons why 'Leptospirilium'-like species rather than Thiobacillus ferrooxidans are the dominant iron-oxidizing bacteria in many commercial processes for the biooxidation of pyrite and related ores

Article Abstract:

A study was conducted to analyze reasons why commercial processes for the biooxidation of pyrite and related ores are dominated by Leptospirillum ferrooxidans. Experimental results indicated that the dominance of Leptospirillum in industrial processes correlated with the ferric/ferrous ratio. Findings also showed that the redox potential is influenced by the process of treating an ore.

Ores, Pyrites

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