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Genome-based classification of Micromonospora craterilacus sp. nov., a novel actinobacterium isolated from Nemrut Lake


A novel actinobacterial strain, designated NA12T, was isolated from coastal sediment sample of Nemrut Lake, a crater lake in eastern Anatolia, Turkey. The taxonomic position of the strain was established using a polyphasic approach. Cultural and chemotaxonomic characteristics of the strain were consistent with its classification within the family Micromonosporaceae. The 16S rRNA gene sequence analysis of strain NA12T showed that the strain closely related to M. radicis AZ1-13T, M. zingiberis PLAI 1-1T, M. craniella LHW63014T and M. endophytica 202201T with pairwise sequence identity values ranging from 99.4 to 99.3%. Digital DNA–DNA hybridization values between strain NA12T and the closely related type strains were ranged from 41.0 to 18.3% while the average nucleotide identity values were between 87.3 and 86.5%, which are well below the designed cut-off points of 70 and 95%, respectively. The G + C content of genomic DNA was 71.5%. Whole-cell hydrolysates of strain NA12T contained 3-hydroxydiaminopimelic acid and meso-diaminopimelic acid. Cell-wall sugars were composed of arabinose, fucose, glucose, mannose, rhamnose and xylose. The polar lipid profile contained phosphatidylethanolamine, diphosphatidylglycerol, phosphatidylinositol, phosphatidylglycerol, glycophospholipid, amino-phospholipid and two unidentified phospholipids. The predominant menaquinones were MK-9(H6) and MK-9(H4). Major fatty acids were iso-C16:0 and C17:1ω8c. Based upon the consensus of phenotypic and phylogenetic analyses as well as whole genome comparisons, strain NA12T (DSM 100982T = KCTC 39647T) is proposed to represent the type strain of a novel species, Micromonospora craterilacus sp. nov.

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( Tree inferred with FastME (Lefort et al. 2015) from GBDP distances calculated from genome sequences. The branch lengths are scaled in terms of GBDP distance formula d5. The numbers above branches are GBDP pseudo-bootstrap support values > 60% from 100 replications, with an average branch support of 91.0%. The tree was rooted at the midpoint (Farris 1972). Leaf labels with different colours indicate species and subspecies clusters


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Hilal Ay was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) PhD scholarship. The genome sequencing was provided by MicrobesNG (, which is supported by the BBSRC (grant number BB/Lo24209/1).

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HA, NS and KI designed the study. HA and IN conducted physiological experiments. HPK, HA, IN, JMI designed chemotaxonomic analyses. HA carried out genome sequence analysis. DC carried out scanning electron microscopy analysis.

Correspondence to Hilal Ay.

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Ay, H., Nouioui, I., Klenk, H. et al. Genome-based classification of Micromonospora craterilacus sp. nov., a novel actinobacterium isolated from Nemrut Lake. Antonie van Leeuwenhoek (2020).

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  • Nemrut Lake
  • Phylogenomics
  • Polyphasic taxonomy