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Paracoccus sulfuroxidans sp. nov., a sulfur oxidizer from activated sludge

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Zhong-Guan-Cun, Haidian, Beijing 100080, P. R. China
² Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Correspondence
Shuang-Jiang Liu
liusj{at}sun.im.ac.cn

Bacterial strain LW36^T was isolated from activated sludge of a wastewater-treatment bioreactor. Cells of strain LW36^T were Gram-negative coccoids to short rods, 1.0–1.2x0.5 µm in size. Colonies were cream-coloured, smooth and circular. Strain LW36^T was hetero-organotrophic and chemolithotrophic and was able to use reduced sulfur as an energy resource. Growth was observed at 25–36 °C and pH 5–10. The most abundant cellular fatty acid of strain LW36^T was C_{18 : 1}7c (64.2 %). The sole respiratory quinone was ubiquinone-10. The G+C content of the genomic DNA was 61.3 mol% (T_m). 16S rRNA gene sequence analysis indicated that strain LW36^T was phylogenetically related to members of the genus Paracoccus, with similarities ranging from 92.4 to 94.9 %. Based on these results, it is concluded that strain LW36^T represents a novel species of the genus Paracoccus, for which the name Paracoccus sulfuroxidans is proposed. The type strain is strain LW36^T (=CGMCC 1.5364^T=JCM 14013^T).

A scanning electron micrograph of cells of strain LW36^T and a table showing its cellular fatty acid profile are available as supplementary material in IJSEM Online.

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