Maribius pontilimi sp. nov., isolated from a tidal mudflat

Area of Science:

• Microbiology
• Bacteriology
• Marine Biology

Background:

• Marine environments harbor diverse microbial life.
• Accurate taxonomic classification is crucial for understanding microbial roles.
• The genus Maribius comprises marine bacteria with specific phylogenetic and physiological traits.

Purpose of the Study:

• To isolate and characterize a novel marine bacterium from a Korean tidal mudflat.
• To determine the taxonomic position of the novel isolate using a polyphasic approach.
• To propose a new species within the genus Maribius.

Main Methods:

• Isolation of strain GH1-23 from a tidal mudflat sample.
• Polyphasic taxonomic investigation including physiological and biochemical tests.
• 16S rRNA gene sequence analysis and DNA-DNA hybridization.
• Determination of DNA G+C content and cellular fatty acid composition.

Main Results:

• Strain GH1-23 is a strictly aerobic, chemoheterotrophic, Gram-negative marine bacterium.
• Phylogenetic analysis based on 16S rRNA gene sequences showed highest similarity (97.5%) to Maribius salinus.
• DNA-DNA relatedness values with Maribius type strains were low (33-39%), supporting novelty.
• DNA G+C content was 66.7 mol%, and predominant fatty acids and polar lipids were identified.

Conclusions:

• Strain GH1-23 represents a distinct species within the genus Maribius.
• The proposed name for this novel species is Maribius pontilimi sp. nov.
• This finding expands the known diversity of the Maribius genus in marine ecosystems.