Abstract
A bacterial isolate S23 capable of oxidizing thiosulfate was isolated from a sulfur spring. Strain S23 is gram-negative, aerobic, and motile. The G + C content of DNA is 61.4 mol%. The fatty acid composition and phylogenetic analysis of the 16S rRNA gene sequence of strain S23 showed that it is related to the members of the genus Comamonas, and most closely related to Comamonas testosteroni (99.9% sequence similarity). The isolate S23 exhibited thiosulfate oxidation under a mixotrophic growth condition. Polymerase chain reaction (PCR) using soxB-specific primers and DNA sequencing showed the presence of the soxB gene. This is the first report in Comamonas sp. showing thiosulfate oxidation under a mixotrophic growth condition.
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