1887

Abstract

A novel actinomycete, strain SR2-123, belonging to the genus Streptomyces , was isolated from a soil sample collected from the Sakaerat Environmental Research Station, Thailand Institute of Scientific and Technological Research, Nakhon Ratchasima Province, Thailand. The taxonomic position of the strain was characterized using a polyphasic study. Strain SR2-123 contained ll-diaminopimelic acid, glucose, mannose and ribose in whole-cell hydrolysates. The N-acyl type of muramic acid was acetyl. Menaquinones were MK-9(H6), MK-9(H8) and MK-9(H4). The predominant cellular fatty acids were iso-C15 : 0, anteiso-C15 : 0, iso-C16 : 0, anteiso-C17 : 0 and iso-C17 : 0. The major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol, an unknown phospholipid, unknown glycolipids, an unknown aminophospholipid, unknown lipids and an unknown aminolipid. The DNA G+C content was 74.8 mol%. The strain was closely related to Streptomyces coeruleorubidus JCM 4359 (98.5 %), Streptomyces flavofungini JCM 4753 (98.5 %), Streptomyces coerulescens NBRC 12758 (98. 5 %) and Streptomyces alboflavus JCM 4615 (98.4 %), based on 16S rRNA gene sequence similarities. The novel strain exhibited low DNA–DNA relatedness values with the type strains (11.4–25.0 %) of closely related species. On the basis of phenotypic and genotypic characteristics, strain SR2-123 could be distinguished from closely related species of the genus Streptomyces and represents a novel species of the genus Streptomyces for which the name Streptomyces xylanilyticus sp. nov. is proposed. The type strain is SR2-123 (=TISTR 2493=KCTC 39909).

Keyword(s): soil , Streptomyces and xylanase activity
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2017-09-18
2019-10-14
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