Deinococcus multiflagellatus sp. nov., isolated from a car air-conditioning system

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Radiation Resistance Studies

Background:

• Microbial life exists in diverse and extreme environments, including artificial systems like car air conditioners.
• The genus Deinococcus is known for its remarkable radiation resistance and diverse metabolic capabilities.
• Characterizing novel bacterial isolates is crucial for understanding microbial biodiversity and potential applications.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from a car air-conditioning system.
• To determine the phylogenetic and chemotaxonomic properties of the isolate.
• To propose a new species classification for the novel bacterium.

Main Methods:

• Isolation and cultivation of bacterial strain ID1504^T.
• Gram staining, motility tests, and morphological observations.
• Phylogenetic analysis based on 16S rRNA gene sequencing.
• Fatty acid, respiratory quinone, and polar lipid analysis.
• DNA G+C content determination.

Main Results:

• Strain ID1504^T is a gamma radiation-resistant, pink-to-red pigmented, Gram-negative, aerobic, motile, short rod-shaped bacterium.
• Phylogenetic analysis placed the strain within the genus Deinococcus, with high similarity to D. arenae, D. actinosclerus, and D. soli.
• Predominant fatty acids included C_17:0, C_16:0, summed feature 3, and iso-C_17:0. MK-8 was the major respiratory quinone.
• The DNA G+C content was 68.3 mol%.

Conclusions:

• Strain ID1504^T represents a novel species within the genus Deinococcus.
• The proposed name for the novel species is Deinococcus multiflagellatus sp. nov.
• This discovery contributes to the understanding of microbial adaptation in artificial environments and the radiation resistance of Deinococcus species.