Eco-omics analyse of microbial sulfur cycle in aquatic environments of cryosphere

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Microbial sulfur cycle in aquatic systems of cryosphere is still unclear although the significance of systems linking carbon and nitrogen cycles has been pointed out. Analysis of aprA gene, which encodes a key enzyme in dissimilatory sulfate reduction and sulfur oxidation, showed that newly isolated Sulfuricella denitrificans-like sulfur oxidizer is a key species from geographically distant lakes in Antarctica and Japan. The complete genome sequence analysis indicated their unique sulfur metabolic pathway adapting freshwater environment. The proteomics results suggest that maintenance of proper translation is critical for growth under low-temperature.