Trichococcus shcherbakoviae sp. nov., isolated from a laboratory-scale anaerobic EGSB bioreactor operated at low temperature Free

Abstract

A new species of the genus Trichococcus , strain Art1, was isolated from a psychrotolerant syntrophic propionate-oxidizing consortium, obtained before from a low-temperature EGSB reactor fed with a mixture of VFAs (acetate, propionate and butyrate). The 16S rRNA gene sequence of strain Art1 was highly similar to those of other Trichococcus species (99.7–99.9 %) but digital DNA–DNA hybridization values were lower than those recommended for the delineation of a novel species, indicating that strain Art1 is a novel species of the genus Trichococcus . Cells of strain Art1 are non-motile cocci with a diameter of 0.5–2.0 µm and were observed singularly, in pairs, short chains and irregular conglomerates. Cells of Art1 stained Gram-positive and produced extracellular polymeric substances . Growth was optimal at pH 6–7.5 and cells could grow in a temperature range of from −2 to 30 °C (optimum 25–30 °C). Strain Art1 can degrade several carbohydrates, and the main products from glucose fermentation are lactate, acetate, formate and ethanol. The genomic DNA G+C content of strain Art1 is 46.7 %. The major components of the cellular fatty acids are C16 : 1 ω9c, C16 : 0 and C18 : 1 ω9c. Based on genomic and physiological characteristics of strain Art1, a new species of the genus Trichococcus, Trichococcus shcherbakoviae, is proposed. The type strain of Trichococcus shcherbakoviae is Art1 (=DSM 107162 = VKM B–3260).

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2019-01-03
2024-03-29
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