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Microorganisms
Volume 13
Issue 12
10.3390/microorganisms13122661
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

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

by
Zengzhi Liu
1,2,
Meng Zhang
1,
Qiliang Lai
3,
Shanshan Xu
1,* and
Ying Xu
1
1
Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518055, China
2
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
3
Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
*
Author to whom correspondence should be addressed.
Microorganisms 2025, 13(12), 2661; https://doi.org/10.3390/microorganisms13122661 (registering DOI)
Submission received: 16 October 2025 / Revised: 19 November 2025 / Accepted: 20 November 2025 / Published: 22 November 2025
(This article belongs to the Section Environmental Microbiology)
Versions Notes

Abstract

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 (C18:1 ω6c and/or C18:1 ω7c). 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.
Keywords: Youngimonas; brittle star; genomic analysis; quorum-quenching Youngimonas; brittle star; genomic analysis; quorum-quenching

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MDPI and ACS Style

Liu, Z.; Zhang, M.; Lai, Q.; Xu, S.; Xu, Y. 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. Microorganisms 2025, 13, 2661. https://doi.org/10.3390/microorganisms13122661

AMA Style

Liu Z, Zhang M, Lai Q, Xu S, Xu Y. 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. Microorganisms. 2025; 13(12):2661. https://doi.org/10.3390/microorganisms13122661

Chicago/Turabian Style

Liu, Zengzhi, Meng Zhang, Qiliang Lai, Shanshan Xu, and Ying Xu. 2025. "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" Microorganisms 13, no. 12: 2661. https://doi.org/10.3390/microorganisms13122661

APA Style

Liu, Z., Zhang, M., Lai, Q., Xu, S., & Xu, Y. (2025). 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. Microorganisms, 13(12), 2661. https://doi.org/10.3390/microorganisms13122661

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