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Abstract

A mesophilic, hydrogenotrophic methanogen, strain S3Fa, was isolated from sediments collected by Ocean Researcher I cruise ORI-934 in 2010 near the submarine mud volcano MV4 located at the upper slope of south-west Taiwan. The methanogenic substrates utilized by strain S3Fa were formate and H/CO but not acetate, secondary alcohols, methylamines, methanol or ethanol. Cells of strain S3Fa were non-motile, irregular cocci, 0.5–1.0 μm in diameter. The surface-layer protein showed an Mr of 128 000.The optimum growth conditions were 37 °C, pH 7.1 and 0.17 M NaCl. The DNA G+C content of the genome of strain S3Fa was 62.3 mol %. Phylogenetic analysis revealed that strain S3Fa was most closely related to JR1 (99.3 % 16S rRNA gene sequence similarity). Genome relatedness between strain S3Fa and JR1 was computed using both genome-to-genome distance analysis (GGDA) and average nucleotide identity (ANI) with values of 46.3–55.5 % and 93.08 %, respectively. Based on morphological, phenotypic, phylogenetic and genomic relatedness data, it is evident that strain S3Fa represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is S3Fa ( = BCRC AR10044 = DSM 29354).

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2015-07-01
2021-02-28
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