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A novel sulfur oxidizer, strain wk12T, was isolated from an industrially synthesized lead (II) sulfide. The G+C content of the genomic DNA was around 58.5 mol%. The major components in the cellular fatty acid profile were summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c), C16 : 0 and summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c). The strain oxidized lead sulfide, thiosulfate and tetrathionate as electron donors to support autotrophic growth. Cells of strain wk12T were motile, rod-shaped (0.5-1.0 × 0.7-2.2 μm), and Gram-stain-negative. For growth, the temperature range was 5-37 °C, and optimum growth was observed at 28-32 °C. The pH range for growth was 5.8-8.7, with optimum growth at pH 6.4-7.1. Optimum growth of the isolate was observed in medium without NaCl, and no growth was observed in the medium containing 0.5 M or more NaCl. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate belongs to the class Acidithiobacillia. The closest relative with a validly published name was Thermithiobacillus tepidarius DSM 3134T, with a 16S rRNA gene sequence similarity of 96 %. On the basis of phylogenetic and phenotypic properties, strain wk12T represents a novel species of the genus Thermithiobacillus, for which the name Thermithiobacillus plumbiphilus sp. nov. is proposed. The type strain is wk12T ( = NBRC 111508T = DSM 101799T).

Thermithiobacillus plumbiphilus sp. nov., a sulfur-oxidizing bacterium isolated from lead sulfide