1887

Abstract

An autotrophic, hydrogenotrophic methanogen, designated strain 17A1, was isolated from the profundal sediment of the meromictic Lake Pavin, France. The cells of the novel strain, which were non-motile, Gram-staining-negative rods that measured 2–15 µm in length and 0.2–0.4 µm in width, grew as filaments. Strain 17A1 grew in a mineral medium and its growth was stimulated by the addition of yeast extract, vitamins, acetate or rumen fluid. Penicillin, vancomycin and kanamycin reduced growth but did not completely inhibit it. Growth occurred at 14–41 °C (optimum 30 °C), at pH 5.0–8.5 (optimum pH 6.5) and with 0–0.4 M NaCl (optimum 0.1 M). The novel strain utilized H/CO and methanol/H as substrates but not formate, acetate, methylamine/H, isobutanol or 2-propanol. Its genomic DNA G+C content was 37.0 mol%. In phylogenetic analyses based on 16S rRNA gene sequences, strain 17A1 appeared to be a member of the genus , with 8-2 (96.3 % sequence similarity) identified as the most closely related established species. Based on phenotypic and phylogenetic data, strain 17A1 represents a novel species of methanogen within the genus , for which the name sp. nov. is proposed. The type strain is 17A1 ( = DSM 24406 = JCM 17760).

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2012-07-01
2020-01-19
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