Hyunsoonleella ulvae sp. nov., isolated from algae in China

Area of Science:

• Microbiology
• Marine Biology
• Genomics

Background:

• The genus *Hyunsoonleella* belongs to the *Flavobacteriaceae* family within the *Bacteroidota* phylum.
• Bacterial isolates from marine environments are crucial for understanding microbial diversity and potential biotechnological applications.

Purpose of the Study:

• To characterize a novel bacterial strain, HU1-3^T, isolated from *Ulva* algae in China.
• To determine the phylogenetic and genomic features of strain HU1-3^T and propose its taxonomic classification.

Main Methods:

• Phylogenetic analysis based on 16S rRNA gene sequences.
• Determination of optimal growth conditions (temperature, pH, salinity).
• Genome sequencing and analysis, including G+C content and average nucleotide identity (ANI).
• Chemotaxonomic analysis of major fatty acids, respiratory quinones, and polar lipids.

Main Results:

• Strain HU1-3^T is a Gram-stain-negative, aerobic, non-motile, rod-shaped, yellow-pigmented bacterium.
• Phylogenetic analysis places strain HU1-3^T within the genus *Hyunsoonleella*, with 97.6% 16S rRNA gene sequence similarity to *Hyunsoonleella flava* T58^T.
• The draft genome size is 4.1 Mbp with a G+C content of 33.9mol%. ANI value with *Hyunsoonleella jejuensis* CNU004^T is 77.9%.
• Major fatty acids include iso-C_15:0, iso G-C_15:1, and iso-C_17:0 3-OH. MK-6 is the major respiratory quinone.
• The genome contains numerous glycoside hydrolase genes, indicating potential for polysaccharide degradation.

Conclusions:

• Strain HU1-3^T represents a novel species of the genus *Hyunsoonleella*, named *Hyunsoonleella ulvae* sp. nov.
• The presence of polysaccharide-degrading enzymes suggests potential biotechnological applications for this novel marine bacterium.