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Background  Myxobacteria harbor numerous biosynthetic gene clusters that can produce a diverse range of secondary metabolites.  Minicystis rosea  DSM 24000 T  is a soil-dwelling myxobacterium belonging to the suborderSorangiineae and family  Polyangiaceae  and is known to produce various secondary metabolites as well as polyunsaturated fatty acids (PUFAs). Here, we use whole-genome sequencing to explore the diversity of biosynthetic gene clusters in  M. rosea .    Results  Using PacBio sequencing technology, we assembled the 16.04 Mbp complete genome of  M. rosea  DSM 24000 T , the largest bacterial genome sequenced to date. About 44% of its coding potential represents paralogous genes predominantly associated with signal transduction, transcriptional regulation, and protein folding. These genes are involved in various essential functions such as cellular organization, diverse niche adaptation, and bacterial cooperation, and enable social behavior like gliding motility, sporulation, and predation, typical of myxobacteria. A profusion of eukaryotic-like kinases (353) and an elevated ratio of phosphatases (8.2/1) in  M. rosea  as compared to other myxobacteria suggest gene duplication as one of the primary modes of genome expansion. About 7.7% of the genes are involved in the biosynthesis of a diverse array of secondary metabolites such as polyketides, terpenes, and bacteriocins. Phylogeny of the genes involved in PUFA biosynthesis ( pfa ) together with the conserved synteny of the complete  pfa  gene cluster suggests acquisition via horizontal gene transfer from Actinobacteria .Conclusion  Overall, this study describes the complete genome sequence of  M. rosea , comparative genomic analysis to explore the putative reasons for its large genome size, and explores the secondary metabolite potential, including the biosynthesis of polyunsaturated fatty acids.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12864-021-07955-x.

Complete genome sequence and identification of polyunsaturated fatty acid biosynthesis genes of the myxobacterium Minicystis rosea DSM 24000T