Microorganisms 2025 Nov 22;1312:. doi: 10.3390/microorganisms13122661.

Youngimonas ophiurae sp. nov., a Quorum-Quenching Marine Bacterium Isolated from a Brittle Star in the South China Sea, and Reclassification of Lutimaribacter litoralis as Youngimonas litoralis comb. nov.

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Two novel bacterial strains, designated S70T and S69A, were isolated from a marine brittle star collected in the South China Sea. These strains are Gram-stain-negative, non-motile, aerobic, and rod-shaped. A phylogenomic analysis indicated that strains S70T and S69A formed a distinct branch with Youngimonas vesicularis CC-AMW-ET and Lutimaribacter litoralis JCM 17792T. The DNA G+C content of both strains was 61.5%. The digital DNA-DNA hybridization values with the closest relatives were 21.8, and 21.2%, respectively. Furthermore, the average nucleotide identity (ANIb) values between strain S70T and these two reference strains were 74.9% and 74.6%, respectively, both well below the 95-96% threshold for dividing prokaryotic species. The major fatty acids of strain S70T were summed feature 8 (C18:1ω6c and/or C18:1ω7c). Functional genomic analysis revealed that strain S70T possesses potential for hydrocarbon degradation and may play a significant role in sulfur metabolism. Additionally, strain S70T exhibited broad-spectrum AHL-degrading activity and, most notably, significantly inhibited soft rot caused by Pectobacterium carotovorum in potato tuber assays. Genomic comparisons further support the reclassification of Lutimaribacter litoralis into the genus Youngimonas.

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