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Abstract

A novel marine actinomycete, designated LHW63021, was isolated from a marine sponge, genus Craniella, collected in the South China Sea. A polyphasic approach was applied to characterize the taxonomic position of this strain. The strain was found to have scarce aerial mycelia that differentiated into spore chains. The cell-wall hydrolysates contained meso-diaminopimelic acid as the diagnostic diamino acid. Glucose, galactose, mannose and madurose were found in the whole-cell hydrolysates. The dominant polar lipids were phosphatidylinositol and diphosphatidylglycerol. MK-9(H6) and MK-9(H8) were the predominant menaquinones. The major fatty acids were iso-C16 : 0, iso-C18 : 0, 10-methyl C17 : 0 and C18 : 1 ω9c. The DNA G+C content based on the draft genome sequence was 72.0 mol%. 16S rRNA gene sequence analysis indicated that strain LHW63021 was a member of the genus Actinomadura and had the highest similarity to Actinomadura echinospora DSM 43163 (97.3 %). Phylogenetic trees supported their close relationship. The average nucleotide identity and digital DNA–DNA hybridization values between the whole genome sequences of strain LHW63021 and A. echinospora DSM 43163 were 79.13 and 23.20 %, respectively. The evidence from the polyphasic study shows that strain LHW63021 represents a novel species of the genus Actinomadura , for which the name Actinomadura craniellae sp. nov. is proposed. The type strain is LHW63021 (=DSM 106125=CCTCC AA 2018015).

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2019-02-19
2020-01-17
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