Genome-based classification of Streptomyces anatolicus sp. nov., an actinobacterium with antimicrobial and cytotoxic activities, and reclassification of Streptomyces nashvillensis as a later heterotypic synonym of Streptomyces tanashiensis

Ates H., Saygın H., CORA M., KILIÇ A. O., AY H.

Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology, cilt.116, sa.10, ss.1073-1090, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 116 Sayı: 10
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s10482-023-01864-7
  • Dergi Adı: Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, EMBASE, Environment Index, Food Science & Technology Abstracts, Veterinary Science Database
  • Sayfa Sayıları: ss.1073-1090
  • Anahtar Kelimeler: Actinobacteria, Antimicrobial activity, Cytotoxic activity, Genome mining, Phylogenomic
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

During the course of isolating novel actinobacteria producing bioactive metabolites, strain BG9HT was obtained from an arid soil sample in Erzurum, Turkey. Pairwise sequence comparisons for 16S rRNA gene sequences showed the strain was a member of the genus Streptomyces and it shared the highest 16S rRNA gene sequence identity of 99.7% with Streptomyces huasconensis HST28T. Comparative genome analyses based on digital DNA–DNA hybridization and average nucleotide identity revealed that strain BG9HT represents a novel species within the genus Streptomyces. The polyphasic analysis also confirmed that the strain has typical characteristics of the genus Streptomyces. The strain has LL-diaminopimelic acid as diagnostic amino acid, and galactose, mannose and trace amounts of glucose and ribose as whole-cell sugars. Polar lipid profile consisted of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol, unidentified aminolipids, phospholipids and lipids. Major isoprenoid quinones were MK-9(H6), MK-9(H4), and MK-9(H8). Its genome size is approximately 7.2 Mb with 71.2% G+C content. The methanolic extract of strain BG9HT showed antimicrobial and cytotoxic activities. Further genomic analyses of strain BG9HT confirmed its high potential to produce novel secondary metabolites. On the basis of phenotypic and phylogenetic analyses, strain BG9HT represents a novel species of the genus Streptomyces, for which Streptomyces anatolicus sp. nov. is proposed, and it holds high promise for novel biosynthetic metabolites of value to the biopharmaceutical industry. We also propose Streptomyces nashvillensis as a later heterotypic synonym of Streptomyces tanashiensis as a result obtained through analysis of overall genome relatedness indices.