Deinococcus reticulitermitis sp. nov., isolated from a termite gut

Area of Science:

• Microbiology
• Bacteriology
• Genomics

Background:

• Termite gut symbionts play crucial roles in nutrient cycling and host physiology.
• Understanding bacterial diversity within termites provides insights into host-microbe interactions and adaptation.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from the gut of the wood-feeding termite Reticulitermes chinensis.
• To determine the phylogenetic and chemotaxonomic properties of the novel isolate.
• To formally propose a new species within the genus Deinococcus.

Main Methods:

• Isolation of bacterial strain TM-1(T) from termite gut.
• Phenotypic characterization including morphology, pigmentation, UV resistance, and growth conditions (temperature, pH, NaCl).
• Phylogenetic analysis using 16S rRNA gene sequences.
• Chemotaxonomic analyses: peptidoglycan composition, cellular fatty acids, quinone analysis, and polar lipid profiling.
• DNA G+C content determination.

Main Results:

• Strain TM-1(T) is a Gram-negative, spherical, non-motile, non-sporulating, red-pigmented bacterium.
• The strain demonstrates resistance to UV radiation and specific growth optima for temperature, pH, and salinity.
• Phylogenetic analysis places TM-1(T) within the Deinococcus genus, with 87.0-94.0% 16S rRNA gene sequence similarity to related species.
• Chemotaxonomic data, including fatty acid profiles and polar lipids, are consistent with the genus Deinococcus.
• The DNA G+C content of the type strain is 65.6 mol%.

Conclusions:

• Based on integrated phylogenetic, chemotaxonomic, and phenotypic data, strain TM-1(T) represents a novel species of the genus Deinococcus.
• The proposed name for this new species is Deinococcus reticulitermitis sp. nov.
• The type strain is TM-1(T) (=CGMCC 1.10218(T)=NBRC 106334(T)).