sp. nov. and Its Secondary Metabolite Biosynthetic Gene Clusters for Polyketide and Nonribosomal Peptide Compounds.

(1) Background: sp. TP-A0598 derived from seawater produces lydicamycin and its congeners. We aimed to investigate its taxonomic status; (2) Methods: A polyphasic approach and whole genome analysis are employed; (3) Results: Strain TP-A0598 contained ll-diaminopimelic acid, glutamic acid, glycine, and alanine in its peptidoglycan. The predominant menaquinones were MK-9(H) and MK-9(H), and the major fatty acids were C, -C, -C, and -C. sp. TP-A0598 showed a 16S rDNA sequence similarity value of 99.93% (1 nucleottide difference) to NRRL B-2347. The digital DNA-DNA hybridisation value between sp. TP-A0598 and its closely related type strains was 25%-46%. Differences in phenotypic characteristics between sp. TP-A0598 and its phylogenetically closest relative, NBRC 3934, suggested strain TP-A0598 to be a novel species. sp. TP-A0598 and NBRC 3934 harboured nine and 13 biosynthetic gene clusters for polyketides and nonribosomal peptides, respectively, among which only five clusters were shared between them, whereas the others are specific for each strain; and (4) Conclusions: For strain TP-A0598, the name sp. nov. is proposed; the type strain is TP-A0598 (=NBRC 110027).