Analysis of the complete genome sequence of a rhizosphere-derived Pseudomonas sp. HN3-2 leads to the characterization of a cyclic lipopeptide-type antibiotic bananamide C.

A fluorescence and biosurfactant-producing strain HN3-2 was isolated from a rhizosphere soil sample of wheat plants and the chromosome of the strain HN3-2 was sequenced and was analyzed by multiple bioinformatics tools in this study. The genome size of the strain HN3-2 is 6,441,476 bp, with a GC content of 60.54%. 16Sr RNA-based phylogeny analysis showed that the strain HN3-2 belongs to Pseudomonas koreensis subgroup in Pseudomonas species. Preliminary data from genome mining have showed that the strain Pseudomonas sp. HN3-2 is capable of producing a peptide-type metabolite. Solid-phase extraction, reversed-phase high performance liquid chromatography (RP-HPLC) together with liquid chromatography-mass spectrometry, high-resolution mass spectrometry and tandem mass spectrometry analysis have led to the purification and identification of a cyclic lipopeptide (CLP) bananamide C (1) from the fermentative broth of the strain Pseudomonas sp. HN3-2. Moreover, the biological activity tests showed that banananmide 3 displays moderate antagonistic activity against Staphylococcus aureus and Escherichia coli. Collectively, these results provide the possibility of developing the CLP bananamide C as a drug leads for medical applications. © King Abdulaziz City for Science and Technology 2022.