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Research Article

Streptomyces hebeiensis sp. nov.

Xu, Ping, Li, Wen-Jun, Wu, Wen-long, Wang, Dong, Xu, Li-Hua, Jiang, Cheng-Lin

International Journal of Systematic and Evolutionary Microbiology 2004; 54(3):727 · https://doi.org/10.1099/ijs.0.02897-0

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Summary auto-generated

Researchers isolated a novel actinomycete strain, YIM 001T, from soil in Hebei province, China during screening for new antibiotic-producing organisms. The strain exhibits morphological and biochemical characteristics typical of Streptomyces species, including white-grey aerial mycelium with straight to flexuous spore chains composed of non-motile, warty-surfaced coccoid spores. Chemical analysis revealed LL-diaminopimelic acid in the cell wall, glucose as the primary whole-cell sugar, and menaquinones MK-9(H6) as the predominant form. The DNA G+C content was 71.4 mol%. Phylogenetic analysis of 16S rRNA gene sequences placed strain YIM 001T within the genus Streptomyces, forming a distinct branch from closely related species including S. sampsonii, S. beijiangensis, and S. tuirus. DNA-DNA hybridization studies with related strains showed low relatedness values (8.1-21.3%), confirming genetic distinctness. Phenotypic comparisons revealed multiple distinguishing features from related species, particularly in spore chain morphology and carbohydrate utilization patterns. Based on comprehensive genotypic, chemotaxonomic, and phenotypic analyses, the authors propose strain YIM 001T as the type strain of a novel species, designated Streptomyces hebeiensis sp. nov.

Key findings

  • Strain YIM 001T, isolated from Chinese soil, represents a novel Streptomyces species with characteristic white-grey aerial mycelium and straight to rectiflexibiles spore chains
  • 16S rRNA phylogenetic analysis shows YIM 001T forms a distinct branch with 97.4-97.6% sequence similarity to nearest relatives, confirmed by low DNA-DNA hybridization values (8-21%)
  • The strain contains diagnostic chemotaxonomic markers including LL-diaminopimelic acid, phosphatidylethanolamine, and menaquinone MK-9(H6) as the major form, with DNA G+C content of 71.4 mol%
  • YIM 001T can be differentiated from related species by spore chain morphology, diffusible pigment production, and substrate utilization patterns, particularly utilization of arabinose and rhamnose

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Abstract

A novel actinomycete strain, YIM 001T, was isolated from a soil sample collected from Hebei province, People's Republic of China. The strain was characterized by white to grey aerial mycelium. Long spore chains, borne on the aerial mycelium, were straight to Rectiflexibiles; the spore chains were composed of non-motile and coccoid spores with a warty surface. The cell wall of strain YIM 001T contained LL-diaminopimelic acid (A2pm) and traces of meso-A2pm. Whole-cell hydrolysates contained mainly glucose and small amounts of xylose, galactose and arabinose. The menaquinones were MK-9(H4) (4·6 %), MK-9(H6) (60 %), MK-9(H8) (30·7 %) and MK-9(H10) (4·7 %). Phosphatidylethanolamine was the diagnostic phospholipid. The DNA G+C content of strain YIM 001T was 71·4 mol%. Phylogenetic analysis indicated that strain YIM 001T belongs to the genus Streptomyces. Based on its phenotypic and genotypic characteristics, strain YIM 001T (=CCTCC AA 203005T=CIP 107974T=DSM 41837T) is proposed as the type strain of a novel species, Streptomyces hebeiensis sp. nov.