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Hippea maritima gen. nov., sp. nov., a new genus of thermophilic, sulfur-reducing bacterium from submarine hot vents

M. L. Miroshnichenko¹, F. A. Rainey^2,, M. Rhode³ and E. A. Bonch-Osmolovskaya¹

¹ Institute of Microbiology, Russian Academy of Sciences, Prospect 60 Letiya Oktyabrya 7/2, 117811 Moscow, Russia
² DSMZ German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
³ GBF, German National Biotechnology Center, Braunschweig, Germany

Author for correspondence: M. L. Miroshnichenko. Tel: +7 095 1350131. Fax: +7 095 1356530. e-mail: mir{at}inmi.host.ru

ABSTRACT

Three strains of moderately thermophilic, sulfur-reducing bacteria were isolated from shallow-water hot vents of the Bay of Plenty (New Zealand) and Matupi Harbour (Papua New Guinea). Cells of all isolates were short, Gram-negative, motile rods with one polar flagellum. All strains were obligate anaerobes and grew optimally at pH 5.8-6.2, 52-54 °C and 2.5-3% (w/v) NaCI. Growth substrates were molecular hydrogen, acetate and saturated fatty acids; one of the strains, isolated from Matupi Harbour, was able to utilize ethanol. Elemental sulfur was required for growth. H₂S and CO₂ were the only growth products. No growth occurred in the absence of 100 mg yeast extract I^–1. The G+C content of the DNA determined for the type strain MH₂^T was 40.4 mol%. Results of 16S rDNA sequencing indicated that these strains represent a distinct lineage most closely related to the genus Desulfurella. On the basis of the results of morphological, physiological and phylogenetic studies, a new genus, Hippea gen. nov., is proposed with the type species Hippea maritima gen. nov., sp. nov., of which the type strain is MH₂^T (= DSM 10411^T).

Key Words: Hippea maritima gen. nov. • sp. nov. • thermophilic bacteria • sulfur reduction • submarine hot vents

The EMBL accession number for the 16S rDNA sequence of strain MH₂^T is Y18292.

Present address: Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.

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