Paracoccus shandongensis sp. nov., Isolated from Activated Sludge

Area of Science:

• Microbiology
• Bacteriology
• Environmental Science

Background:

• Wastewater treatment plants are crucial for environmental health.
• Microbial communities in activated sludge play vital roles in pollutant degradation.
• Characterizing novel bacteria aids in understanding microbial ecosystems and potential applications.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from activated sludge.
• To determine the taxonomic position of the novel strain using a polyphasic approach.
• To propose a new species and name for the identified bacterium.

Main Methods:

• Isolation and cultivation of bacteria from activated sludge.
• Physicochemical characterization (Gram staining, morphology, growth conditions).
• Phylogenetic analysis based on 16S rRNA gene sequencing.
• Genomic analysis (genome size, DNA G+C content).
• Chemotaxonomic analysis (respiratory quinones, fatty acids, polar lipids).

Main Results:

• A novel Gram-negative, aerobic, rod-shaped bacterium, strain wg2^T, was isolated.
• Strain wg2^T exhibited optimal growth at 30°C, 0-2.0% NaCl, and pH 7.0.
• Phylogenetic analysis placed strain wg2^T within the genus Paracoccus, with high 16S rRNA gene similarity to P. sediminis and P. fontiphilus.
• Genomic and chemotaxonomic data supported its classification as a distinct species.
• The genome size was 3.93 Mbp with a DNA G+C content of 66.05%.

Conclusions:

• Strain wg2^T represents a novel species of the genus Paracoccus.
• The proposed name for the novel species is *Paracoccus shandongensis* sp. nov.
• The type strain is wg2^T (KCTC 72862^T = CCTCC AB 2019401^T).