Rhodococcus subtropicus sp. nov., a new actinobacterium isolated from a cave

International Journal of Systematic and Evolutionary Microbiology
Soon Dong LeeIn Seop Kim

Abstract

A novel Gram-stain-positive actinobacterial strain, designated C9-28T, was isolated from soil sampled in a natural cave on Jeju Island, Republic of Korea. Strain C9-28T morphologically exhibited a rod-coccus life cycle and grew at 10-37 °C (optimum, 30 °C), pH 6-9 (optimum, pH 7) and 0-3 % (optimum, absence of NaCl). In the maximum-likelihood tree based on 16S rRNA gene sequences, strain C9-28T formed a sublineage between a Rhodococcus equi-Rhodococcus soli-Rhodococcus agglutinans clade and the type strain of Rhodococcus defluvii. The closest relatives of strain C9-28T were the type strains of R. defluvii (98.88 % 16S rRNA gene sequence similarity), R. equi (98.88 %) and R. soli (98.60 %). The phylogenomic tree based on whole genome sequences supported the distinct position of the novel strain within the genus Rhodococcus. The following chemotaxonomic characteristics also supported the assignment to the genus: meso-diaminopimelic acid; arabinose and galactose in whole-cell hydrolysates; the predominant menaquinone of MK-8(H2); and polar lipids including diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannoside, three unidentified glycolipids and two unidentified...Continue Reading

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Citations

May 28, 2020·Microorganisms·Daniel Garrido-SanzRafael Rivilla
Jun 17, 2020·International Journal of Systematic and Evolutionary Microbiology·Soon Dong LeeYochan Joung

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