This research was funded by the United States National Science Foundation grants OCE- 194 0752469 and OCE-0937404
International Journal Of Systematic And Evolutionary Microbiology
Thermophilic bacteria -- Pacific Ocean, Water -- Microbiology, Thermophilic bacteria -- Phylogeny, Hydrothermal vent ecology -- Pacific Ocean
A novel moderately thermophilic, heterotrophic bacterium was isolated from a deep-sea hydrothermal vent deposit from the Mariner field along the Eastern Lau Spreading Center, Southwestern Pacific. Cells were short motile rods (about 0.4 μm-0.8 μm) that occurred singly or in pairs and were surrounded by a sheath-like membrane or ‘toga’. The cells grew between 45 and 65°C (optimum 57-60°C), pH 4.1-6.0 (optimum pH 5.5-5.7) and optimally at 3% (w/v) NaCl. The isolate grew on a range of carbon and proteinaceous substrates and reduced sulfur. The G + C content of the DNA was about 45 mol%. Phylogenetic analysis of the 16S rRNA gene placed the new isolate as a deeply diverging lineage within the Thermotogales. Based on the physiological, morphological and phylogenetic data, the isolate is a novel species of a new genus with the proposed name Mesoaciditoga lauensis gen. nov. sp. nov. The type strain is cd-1655RT (DSM 25116, OCM 1212).
Reysenbach, A. L., Y. Liu, A. R. Lindgren, I. D. Wagner, C. D. Sislak, A. Mets, and S. Schouten. "Mesoaciditoga lauensis gen. nov., sp. nov., a moderate thermoacidophilic Thermotogales from a deep-sea hydrothermal vent." International journal of systematic and evolutionary microbiology (2013).