Pseudomonas izuensis sp. nov., a novel species isolated from Izu Oshima, Japan

Characteristics of soil origin Pseudomonas batumici Koz11 isolated from a remote island in Japan

Soil samples from a remote Japanese island (Kozushima) were processed and investigated for organisms exhibiting antimicrobial activity against pathogenic strains. A Pseudomonas strain demonstrating antimicrobial activity against Staphylococcus aureus (S. aureus) was identified, prompting further investigation. Whole-genome sequencing was employed to identify the species and conduct phylogenetic analysis, followed by in silico molecular analysis. Chemotaxonomic and biochemical analyses were conducted to further characterize the strain. Genomic analysis identified the strain of interest as Pseudomonas batumici (P. batumici), originally isolated from soil of the Black Sea coast of the Caucasus in 1980. P. batumici Koz11 is the second P. batumici strain to be isolated and identified outside its initial area of discovery. Similar to the type strain, P. batumici Koz11 showed antimicrobial activity against various S. aureus strains, including methicillin-resistant S. aureus (MRSA) and vancomycin-resistant S. aureus (VRSA). However, the previously reported 'batumin gene cluster', which synthesizes antimicrobial compounds, was absent from P. batumici Koz11. This study provides new insights into P. batumici. Since the type strain of P. batumici is exclusively deposited in the Ukrainian Collection of Microorganisms, the Koz11 strain may serve as a surrogate to facilitate continued study of P. batumici.

Pseudomonas allokribbensis sp. nov. and Pseudomonas gozinkensis sp. nov., Two New Species Isolated from a Volcanic Island, Izu Oshima, Japan

The genomes of two Pseudomonas strains, IzPS23^T and IzPS32d^T isolated from soil samples of Izu Oshima were compared to Pseudomonas type strains. Whole-genome sequence analysis revealed both belong to the Pseudomonas fluorescens lineage. The average nucleotide identity values of the whole-genome sequences of IzPS23^T and IzPS32d^T compared with other type strains showed high correlations with Pseudomonas kribbensis (93.1%) and Pseudomonas glycinae (93.5%), respectively. Genome-to-genome distances between the whole-genome sequences of IzPS23^T and IzPS32d^T showed correlations with Pseudomonas kribbensis (51.0%) and Pseudomonas glycinae (53.2%), respectively. Genotypic and phenotypic analysis indicated the two strains were novel species, and were named Pseudomonas allokribbensis (IzPS23^T = CECT 9961^T, = LMG 31525^T) and Pseudomonas gozinkensis (IzPS32d^T = CECT 9962^T, = LMG 31526^T), respectively.