Streptomyces fodineus sp. nov., an actinobacterium with antifungal activity isolated from mine area soil

2019 
A novel actinobacterial strain producing an antifungal substance was isolated from a sample of acidic mine area soil, and its taxonomic position was evaluated. The novel strain, designated TW1S1T, formed white-grey aerial mycelium and yellow substrate mycelium on oatmeal agar. Growth occurred at 10–45 °C (optimum, 30 °C), pH 4–9 (pH 6–7) and in the presence of up to 8 % (w/v) NaCl. Melanin was produced on peptone–yeast extract–iron agar. Phylogenetic analysis based on its 16S rRNA gene sequence indicated that the novel strain should be assigned to the genus Streptomyces , and the closest species was Streptomyces puniciscabiei S77T with 99.1 % sequence similarity, which was followed by Streptomyces durhamensis NRRL B-3309T (99.0 %), Streptomyces filipinensis NBRC 12860T (98.9 %) and Streptomyces yaanensis Z4T (98.7 %). The chemotaxonomic properties were consistent with those of Streptomyces . ll-Diaminopimelic acid was the diagnostic diamino acid, and alanine, glutamic acid and glycine were present in the peptidoglycan. The cell-wall hydrolysate also contained galactose, glucose, mannose and ribose. The predominant isoprenoid quinones were MK-9(H4) and MK-9(H6), the major polar lipids were phosphatidylglycerol and an unidentified phospholipid, and the main fatty acids were iso-C16 : 0 and anteiso-C15 : 0. However, strain TW1S1T could be distinguished from its neighbouring species by its phenotypic properties. In addition, the genome-based comparison with the closest species indicated that strain TW1S1T should be recognized as a separate species. The phylogenetic, phenotypic and chemotaxonomic as well as genomic evidence supported that TW1S1T represents a novel species of Streptomyces , for which the name Streptomyces fodineus sp. nov. is proposed (type strain, TW1S1T = KCTC 49013T = JCM 32404T).
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